Oklahoma authorities have arrested a man for gunning down his parents and sister last week.

Jacob Mayhugh, 22, has been booked into the Grady County jail on three counts of first degree murder, the Oklahoman reported.

Investigators had been searching for Mayhugh since May 11, when they found James and Patty Mayhugh, 55 and 54, and Shayla Mayhugh, 28, dead in their home in Chickasha, as CrimeOnline reported. Their identities were not immediately released at the time but have since been revealed.

The Oklahoma State Bureau of Investigation said it found the Mayhughs dead  and an AR-15 style rifle lying near the entry in the home, the Oklahoman said. Agents said the serial number on the weapon matched that of one Jacob Mayhugh bought on April 25. He is also alleged to have bought a 9mm pistol at the same time, and that gun was also found inside the home, along with spent shell casings.

Patty Mayhugh was found dead near the doorway, while Shayla Mayhugh and her father were found on the living room floor.

Jacob Mayhugh was seen on surveillance video driving a gray 2000 GMC Yukon in Oklahoma City the night before the bodies were found on May 11. It was located near the intersection of S. Walker and W. California Avenues, parked and locked, at about 4:30 p.m. that day. Video showed a man parking it and walking away at about 7 p.m. on May 10. His girlfriend identified him in the video.

Inside the vehicle, investigators found a black cellphone in a pink case, a black wallet containing the suspect’s driver’s license, $738 in cash, the Yukon’s keys, and two loaded AR-15 style magazines with writing on them in white paint. The AR-style magazine found with the weapon at the home also had writing in white paint, but the affidavit did not say what the writing said.

Mayhugh was arrested in downtown Oklahoma City on Tuesday, the Oklahoman said.

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[Feature Photo: Jacob Mayhugh/Oklahoma State Bureau of Investigation]