Police are searching for a Columbia graduate they want to question in the brutal killing of his girlfriend in their Astoria apartment.

Danielle Thomas, 27, was found dead in her Astoria apartment Tuesday night, reportedly beaten to death.

Police are now trying to find Jason Bohn, the victim’s boyfriend, who was due in court in two weeks on charges of assaulting Thomas, officials said.

Cops said Bohn, 33, was arrested two times this month before the murder on charges of assaulting and harassing Thomas.

Detectives believe that Bohn, who lived with Thomas in their Astoria apartment, has fled New York and turned off his cell phone to avoid being tracked, sources told the Daily News.

According to court documents, he called her cell phone threatening to make her life impossible when she was at the 114th police precinct reporting the abuse.

“It’s war!” he said in a voicemail, according to court documents. “I’ll dedicate my life to hunting you down like a dog in the streets.”

Bohn also proceeded to send harassing emails to Thomas that said she had to stay somewhere else, and he would come back with his friend if she returned, court documents said.

A Queens district attorney’s office spokesman said prosecutors requested $1,000 bail, but Bohn was released without bail.

A restraining order was filed against him at the time of the murder, according to police.

Court reports detail abuse, aggession

According to court documents, on May 24, Bohn punched Thomas around the face and back. This caused bruising and swelling to her left knee and back, the documents said.

On June 7, she received several threatening and harassing emails from Bohn stating that he would return with a friend if she came back, court documents said.

While reporting her attack that same day, officials said they heard a voicemail of him threatening her.

“It’s war! I’ll dedicate my life to hunting you down like a dog in the streets,” he said, according to court documents. “I will make your life impossible.”