The man accused of gunning down a world-renowned CalTech astrophysicist smirked, blew kisses, and mugged for cameras during his court appearance, turning what should have been a solemn proceeding into a spectacle that left the victim's colleagues and the scientific community reeling.

Xiangyu Huang, 35, appeared in Pasadena Superior Court on Monday to face a murder charge in the fatal shooting of Professor Shrinivas Kulkarni, 68, a celebrated astronomer whose work shaped the modern understanding of millisecond pulsars, gamma-ray bursts, and near-Earth asteroids. Huang entered the courtroom in a yellow jail jumpsuit and, as the New York Post reported, displayed a series of bizarre behaviors that drew gasps from those present.

A courtroom turned circus

Huang allegedly grinned at the gallery, blew kisses toward cameras, and at one point appeared to flex for photographers as he was led to the defense table. The display stood in stark contrast to the gravity of the charge against him: one count of murder with a firearm enhancement, which carries a potential sentence of 50 years to life in California state prison.

The defendant did not enter a plea. His arraignment was continued to May 12 after a public defender requested additional time to review the case file. A judge ordered Huang held without bail.

Pasadena Police Chief Gene Harris told reporters that Huang had no known prior relationship with Kulkarni. Harris said investigators believe the shooting was "targeted" but have not publicly identified a motive. The chief added that Huang was arrested within 90 minutes of the shooting after officers spotted a vehicle matching witness descriptions less than two miles from the CalTech campus.

The shooting on campus

Kulkarni was shot multiple times outside the Cahill Center for Astronomy and Astrophysics on the CalTech campus in Pasadena on the afternoon of April 25, a Friday. Campus security officers and Pasadena police responded within minutes. Paramedics transported Kulkarni to Huntington Memorial Hospital, where he was pronounced dead.

Witnesses told police they heard between three and five gunshots and saw a man flee on foot toward a parked sedan. Campus surveillance footage captured images of the suspect and the vehicle, which police described as a dark-colored Hyundai Sonata. Officers located the car in a shopping center parking lot on East Colorado Boulevard and took Huang into custody without incident.

Police recovered a 9mm handgun from the vehicle's trunk, Harris said. Ballistic testing is underway to determine whether it matches shell casings found at the scene. Investigators also seized a laptop and multiple cell phones from the car. Harris declined to discuss the contents of those devices, citing the ongoing investigation.

A giant of modern astronomy

Kulkarni joined CalTech's faculty in 1987 and spent nearly four decades building one of the most consequential careers in observational astronomy. He discovered the first millisecond pulsar in 1982 while still a graduate student at UC Berkeley, a finding that opened an entirely new branch of astrophysics research.

He later helped identify soft gamma repeaters and led the development of the Zwicky Transient Facility, a wide-field survey camera at Palomar Observatory that scans the entire northern sky every two days. The facility has discovered thousands of supernovae and near-Earth asteroids since it began operations in 2018. Much like investigations that hinge on painstaking, methodical searches for answers, Kulkarni's career was defined by patient, systematic observation that yielded breakthroughs others missed.

CalTech President Thomas Rosenbaum released a statement calling Kulkarni "one of the most creative and productive astronomers of his generation."

"Shri's curiosity was boundless, and his contributions to our understanding of the universe are permanent. We are devastated by this senseless act of violence."

The National Academy of Sciences, which elected Kulkarni to membership in 2001, issued its own statement describing his body of work as "transformative." Kulkarni had also received the Dan David Prize, the Shaw Prize in Astronomy, and numerous NASA commendations over the course of his career.

Who is Xiangyu Huang?

Details about Huang remain sparse. Pasadena police confirmed he is a Chinese national who had been living in the San Gabriel Valley area. Harris said Huang held a valid student visa but was not enrolled at CalTech. The chief declined to name the institution where Huang had studied, saying that information was part of the active investigation.

Harris told reporters that Huang had no criminal record in the United States. Immigration and Customs Enforcement has placed a detainer on Huang, meaning federal authorities have asked to be notified before any potential release. The courtroom antics that marked his first appearance have already drawn comparisons to other high-profile criminal defendants whose courtroom behavior became a story in itself.

Neighbors at an apartment complex on South Atlantic Boulevard in Monterey Park told KNBC-TV that Huang kept to himself and rarely interacted with other residents. One neighbor, who asked not to be identified, said Huang moved in approximately six months ago and was "very quiet."

The motive question

The absence of a known connection between Huang and Kulkarni has fueled intense speculation, but police have been careful not to get ahead of the evidence. Harris said investigators are examining Huang's digital footprint, travel history, and financial records. The FBI is assisting with the digital forensics, Harris confirmed.

Los Angeles County District Attorney Nathan Hochman said his office filed the murder charge with a firearm enhancement within 48 hours of the arrest. Hochman told reporters the evidence presented so far is "strong" and that prosecutors will evaluate whether to seek additional charges or special circumstances as the investigation progresses. Special circumstances in California can make a defendant eligible for life without the possibility of parole.

Hochman did not address Huang's courtroom behavior directly but said his office takes "the murder of any member of our community with the utmost seriousness." The DA's measured tone stood in sharp contrast to the defendant's theatrical display just hours earlier. In a legal system where sentencing outcomes can spark fierce public debate, prosecutors appear determined to build a case that leaves no room for leniency.

Campus security under scrutiny

The shooting has renewed questions about security at CalTech's open campus in Pasadena. Unlike many large universities, CalTech does not restrict vehicle or pedestrian access to most of its grounds. The Cahill Center, where Kulkarni was shot, sits near the campus perimeter along California Boulevard.

CalTech's vice president for student affairs, Joseph Shepherd, said the university would conduct a "comprehensive review" of campus security protocols. Shepherd confirmed that CalTech has increased security patrols and added temporary access restrictions to several buildings since the shooting.

Faculty members have expressed frustration. Dr. Mansi Kasliwal, a CalTech astronomer who worked closely with Kulkarni on the Zwicky Transient Facility, told the Los Angeles Times that the campus "never felt unsafe before."

"Shri walked these paths every day for almost 40 years. The idea that someone could just walk onto campus and take his life is something none of us can process."

Kasliwal said Kulkarni had been working on a new survey project and was in the office nearly every day despite being eligible for emeritus status. She described him as a mentor who "made time for everyone, from first-year students to visiting scholars." The loss mirrors the kind of sudden, violent disruption that draws public attention to proceedings that follow, where courtroom developments become as closely watched as the underlying events.

What comes next

Huang's next court date is set for May 12, when he is expected to enter a plea. The public defender's office declined to comment on the case. If Huang cannot afford private counsel, the court will appoint representation at the arraignment.

Pasadena police said they expect to release additional details about the investigation in the coming weeks but cautioned that the digital forensics review could take months. Harris asked anyone with information about Huang or his activities in the weeks before the shooting to contact the department's tip line.

CalTech announced it will hold a memorial service for Kulkarni on May 5 at Beckman Auditorium. Rosenbaum said the event will be open to the public and will include remarks from colleagues, former students, and representatives of the international astronomy community.

A man who spent his life mapping the most violent events in the cosmos was killed by violence no telescope could have predicted. The justice system now has one job: make sure the courtroom smirks end where the evidence begins.