updated 05/13/2011 AT 1:30 PM ET
•originally published 05/13/2011 AT 10:30 AM ET
A woman who police say was living off and on with actor Tom Sizemore in a luxury high-rise Los Angeles apartment has been missing for the past month and a half.
Sizemore, 49, who’s been interviewed by detectives and has been cooperative, is not a suspect in the missing-person case, LAPD Det. Carmine Sasso tells PEOPLE.
Actress Megan Lacy Wren, 25, was last seen in the downtown L.A. area on March 31. Although some have described her as his girlfriend, Sizemore told Det. Sasso that she was just a friend, while the actor’s manager outright dismisses any claims of a romantic involvement between the two.
The woman’s father, Bill Wren, told CBS News that his daughter had been working for the actor as his assistant. Sizemore “indicated that he didn t know where she was,” Bill Wren said.