NEW HAVEN, Conn. -- Yale lab technician Raymond Clark was released to his attorney after complying with police on Wednesday morning.

Police officially named Clark a person of interest in the death of Yale graduate student Annie Le Tuesday night as more than a dozen FBI agents stormed his Middletown apartment.

Police served a search warrant at Clark's Ferry Street apartment in Middletown Tuesday night. Channel 3 Eyewitness News reporter Hena Daniels reported that 18 FBI agents went into the apartment just after 10 p.m. They remained at the apartment through the night and were seen leaving before 8 a.m. Wednesday.

UNCUT: Police Name Clark Person Of Interest In Le's Death Lab Tech Ushered Away For DNA Test

New Haven Police Chief James Lewis said Clark was at the police station Tuesday night, but that he had not been arrested. They said a search warrant was issued for Clark's DNA and that samples would be taken. They said a plethora of physical evidence had been collected from the lab where Le's body was found and that Clark's DNA would be compared to that evidence.

Clark was released at about 3 a.m. Wednesday.

“We’re also making sure that there’s not other potential suspects and so we’re avoiding the issue of tunnel vision and looking at everyone who had access to that building and could have been there during that time. That’s part of the reason that we’ve slowly narrowed this down,” said Lewis.

The manager of the Ferry Street apartment complex where Clark lives told Eyewitness News that he hadn't seen Clark since Thursday.

"We didn't know what was going on, we saw cops all around here," said neighbor Sana Cotten.

According to the Yale University directory, Clark works as a lab tech at the Animal Resources Center.

The remains of 24-year-old Le were found inside a wall the basement area of a Yale lab on Amistad Street on Sunday, Le’s would-be wedding day. The area where Le’s remains were found is used to store animals used for research.

Le was working in the Amistad Street building as a graduate student in pharmacology. The office where Clark worked is very close to where Le was performing her graduate work.

Students told Eyewitness News that the area is secure and that key cards must be swiped twice to access the area.

Le had been missing since Tuesday, when she was last captured by some of the school's 70-plus surveillance cameras entering the lab.

The medical examiner identified the remains as Le’s on Monday, and said the release of the cause of death would be delayed to assist in the investigation.

A listing on a wedding Web site lists a wedding date for Clark and his girlfriend for Dec. 20, 2011. Neighbors said the girlfriend was seen moving things out of the Middletown apartment on Monday, but that she brought take-out food into the home on Tuesday.

The girlfriend's parents told Eyewitness News that the reason no arrest has been made in connection with the case is because police are awaiting the results of forensic tests on clothing.

Eyewitness News attempted to contact Clark Tuesday, but he did not answer his phone.

On Saturday, bloodied clothing was found hidden in a drop ceiling in another part of the building. Police said they were testing to determine whether the clothing belongs to Le or someone else.

Le was remembered Monday night by hundreds at a candlelight vigil on the Yale campus. Many of those who attended the vigil said they didn't personally know Le, but were shook by here death.

"This is not a situation where we need to know her personally to feel it," said student Jordan Zimmerman. "I feel like she's one of us, whether we know her or not."

Le's roommate, Natalie Powers, struggled to hold back tears while describing Le as generous, honest and tenacious.

"That this horrible tragedy happened at all is incomprehensible, but that it happened to her is even more so," Powers said.

Le and fiance, Jonathan Widawsky, had planned to wed at the the North Ritz Club in Syosset, N.Y., on the north shore of Long Island. Police said Widawsky, a Columbia graduate student, was assisting in the investigation and was not considered a suspect. Le and Widawsky are described as college sweethearts, meeting as undergraduates at the University of Rochester. Le received her undergraduate degree from the University of Rochester in New York and majored in cell and developmental biology with a minor in medical anthropology. She conducted a summer project at the National Institutes of Health on bone tissue engineering using mouse mesenchymal stem cells, according to a biography posted on the NIH Web site. While at the University of Rochester, she conducted research involving parasitic wasps.

She is originally from California, and graduated from Union Mine High School in 2003, where she was named "Best of the Best" and "Most Likely To Be The Next Einstein."