Investigators

working the north Fayette double murder case are focusing on illegal drug

activity that occurred at David Mangham's residence, the lead detective

on the case confirmed Thursday.

Lt. Col. Bruce

Jordan of the Fayette County Sheriff's Department said Mangham and Francis

Michael Fowler of Ellenwood were both involved in illegal drug activity.

Both men were found shot to death in Mangham's Princeton Chase home Monday

morning.

"This

is not a crime that we are going to be able to solve quickly because it

involves people from other communities areas of Atlanta where people don't

like to cooperate with police," Jordan said.

The drug angle

is being pursued because the amount of money involved can be a motive

to kill someone, Jordan said.

Fowler occasionally

performed some auto body work for Mangham in a garage at the rear of the

home, police said.

Although some

homicides can't be solved, if this one can be solved, the department should

be able to handle it, Jordan said.

All but one

of the department's detectives have been assigned to the case daily, conducting

interviews for the investigation, Jordan said. The one detective not working

on the case for a particular day stays in the office to handle other cases,

he added.

Earlier in

the week, the department indicated that detectives were interested in

illegal activity some of Mangham's friends might have been involved in.

Mangham also had another "circle of friends" from church social

activities, detectives noted.

Mangham's ex-girlfriend

Terri Gilman of Fayetteville said his sister told her that police said

Mangham might have been going for his gun to defend himself when he was

killed. Police said Mangham's body was found in the master bedroom of

the residence while Fowler was found in the kitchen area.

Mangham used

to carry large amounts of cash with him because he "didn't trust

banks" Gilman said.

Neighbors said

Mangham would have a number of people over at his home working on cars

at times. He would display his cars at shows at the GTO's Drive-In restaurant

in Fayetteville, Gilman said.

"He just

seemed to have a lot of friends," said B.T. Howell, who lives across

the street from Mangham's residence.

"I just

hope they find out who did it," a tearful Gilman said Monday evening.