Raymond Clark III was taken into custody Tuesday night at his apartment in Middletown, Conn., so officials could collect DNA samples.
Clark has been described as a person of interest, not a suspect, in the death of Annie Le. Her body was found stuffed behind a wall in the laboratory Sunday.
Overnight, Connecticut State Police officers sorted through items on a card table set up outside the apartment's door.
A tow truck took away a red Ford Mustang neighbors say was used by Clark.
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Associated Press writer Susan Haigh in Hartford, Conn., and AP news researcher Rhonda Shafner in New York contributed to this report.
Copyright 2009 The Associated Press.