AceShowbiz - Actor Tom Sizemore has reportedly been helping police with their investigations following the disappearance of his girlfriend in March. The "Black Hawk Down" star's actress partner Megan Wren, 25, went missing on March 31 and cops have been attempting to track her down. She was last seen in Los Angeles.

The actor, who had been living with Wren for six months prior to her disappearance, has spoken to police and a source tells TMZ.com he has been "very co-operative". A statement from the Los Angeles Police Department, reads, "The Los Angeles Police Department and the family of Megan Lacy Wren are asking for the public's help in locating her..."

"The family is very concerned about her unexplained disappearance, especially given the fact that she has a serious medical condition, and is need of medical care... Megan Lacy Wren is a female white with brown hair, brown eyes, 5 feet 1 inches tall, weighs 110 pounds, with a slim build, and light complexion."