Casey Collins, left, and Sarah Cook
LILBURN — Police believe they know why Casey Collins and his girlfriend allegedly murdered his grandfather — they’re just not saying.
Seventy-eight-year-old Lilburn resident Edward Smith was reported missing on Sunday, three days after family had last seen him or his vehicle. His body was found Monday inside his pickup truck, Cobb County police spokesman Sgt. Dana Pierce said, at a location described only as in the southern part of that county.
By Tuesday afternoon, Mableton residents Casey Ryan Collins (Smith’s 30-year-old grandson) and Sarah Elizabeth Cook (Collins’ 23-year-old girlfriend) were arrested and charged with felony murder. Few other details were made public.
“We’re pretty certain we know what the motive is in this crime,” Pierce said, “however we are not releasing that information.”
Pierce said investigators believe the murder happened at 365 Kemolay Road in Mableton, and that Smith’s truck and body were found elsewhere. He said he wasn’t positive who lived at that residence — but booking reports for both suspects list that address as their home.
The scene is about 35 miles west of Lilburn. Pierce said he wasn’t sure what ties Smith might have had to the area other than his grandson.
No specifics regarding Smith’s death were released.
“The Cobb County Medical Examiner’s Office will conduct an autopsy to determine the manner and cause of his death,” Pierce said.
Authorities were also vague on how they found Smith’s body and tied it to his grandson.
“The good use of technology and good investigative work,” Pierce said. “That’s what it boiled down to.”