Eddie Routh, the double murder suspect who allegedly killed retired Navy SEAL sniper Chris Kyle and his friend Chad Littlefield, might have committed the crimes to steal Kyle s truck, according to an arrest affidavit obtained by News 8.

Routh confessed to his sister and her husband about the crime on Saturday night, the document says. When they asked whose black truck he was driving, Routh told them he traded his soul for a new truck, according to the affidavit.

The document also detailed new information not previously known since the double murder on Saturday.

Kyle and Littlefield arrived at the Rough Creek Lodge shooting range about 3:15 p.m. on Saturday. Less than two hours later, one of the range officials reported getting an emergency call from three staff members who found the bodies.

CPR was started until EMTs arrived, the arrest affidavit reads. Both men had multiple gunshot wounds and were laying on the ground covered in blood.

Investigators said they also found semi-automatic rifles, semi-automatic handguns and revolvers at the range.

Investigators have said that Routh allegedly stole Kyle s black Ford pick-up truck and drove to his sister s home in Midlothian telling her and her husband that he killed the two men.

Later that night, investigators said they found what they think is the murder weapon, a semi-automatic handgun, at Routh s home in Lancaster.

Routh s sister, Laura Blevins, urged her 25-year-old brother, a former Marine, to turn himself in.

Routh telling his sister he traded his soul for a new truck suggests a possible motive in the crime that so far investigators have not yet pinpointed.

Four months ago, Routh threatened to kill himself and his family, according to Lancaster Police.

His mother called 911 to say her son had been drinking alcohol and was upset with his fatherbecause he was considering selling a familygun.

She stated Eddie began arguing and stated he was going to 'blow his brains out,' according to a police report of the incident on September 20, 2012.

Responding officers also noted the 25-year-old had post traumatic stress disorder.

Officers feared for the safety of Eddie, his family, and others, the report explained. Policeplaced Routhinto protective custody and took himto Green Oaks Psychiatric Hospital for a mental evaluation.

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