LONG BEACH — An investigation was under way Friday into the death of a young woman whose body was discovered Thursday night in her bedroom in Long Beach.

Kate Sue Yi, 20, was found dead about 7:20 p.m. in her residence in the 700 block of Bellflower Boulevard, said Assistant Chief Ed Winter of the Coroner's Office.

According to Long Beach police, officers responded to the residence after receiving an unknown trouble call.

When they arrived at the scene they made contact with the roommate of the 20-year-old female who was found unresponsive inside their apartment. Paramedics were called to the scene and the victim was pronounced dead.

An investigation is ongoing and homicide detectives are following all leads. The cause of death was not immediately released.

Anyone with any information is asked to contact homicide detectives David Rios or Daniel Mendoza at 562....

LONG BEACH, Calif. -- Police have arrested a 20-year-old Mission Viejo man suspected of killing his girlfriend, authorities said Saturday.

Kate Sue Yi, a 20-year-old Cal State Long Beach student, was found dead in her apartment on the 700 block of Bellflower Boulevard at about 7:20 p.m. Thursday, said Long Beach Police Officer Jackie Bezart.

Bezart said Yi's roommate discovered the body.

Authorities launched an investigation that led them to a business in city of Orange on Friday evening, where they arrested Jonathan Huynh in connection with the murder, Bezart said.

Huynh and Yi allegedly had an altercation on the night of the murder, Bezart said. The couple allegedly had a history of domestic violence, she added.

Authorities have not yet released the cause of death.

MISSION VIEJO – The Los Angeles District Attorney's Office is preparing charges against Mission Viejo resident Jonathan Huynh, 20, arrested early Saturday morning on suspicion of strangling his girlfriend.

Jane Robison, the news secretary at the Los Angeles County District Attorney's Office, said that prosecutors were preparing charges against Huynh in connection with his girlfriend's slaying. The body of Cal State Long Beach nursing student Kate Sue Yi, also 20, was found by her roommate Thursday in her Long Beach apartment.

Robison said a copy of the criminal complaint against Huynh, along with an arraignment date, will be available Tuesday.

Police arrested Huynh late Friday at a business in Orange and booked him at 2:15 a.m. Saturday. He's still in custody.

According to police, Yi's roommate came home to their shared apartment, near the campus at Seventh Street and Bellflower Boulevard, and found her unresponsive. She was later pronounced dead by paramedics.

An autopsy showed she died of strangulation, according to news services.

A friend and former roommate Auria Zahed said Kate Yi was a junior and an "amazing student" who had just been admitted this year to the nursing program at California State University, Long Beach.

"She was known for always having a smile on her face and laughing at anything and everything," Zahed said. "She was always such a positive, cheery person. She had many friends and did not mind being goofy. She was very kind, caring and never judged a book by its cover."