Gilbert police arrested a man Sunday in connection with the killing of his 91-year-old stepfather and the attempted killing of his mother, authorities said.

Officers found Oscar Casdorph dead and his 81-year-old wife critically injured Saturday evening after a family member requested a welfare check at their home in the 1300 block of West Straford Avenue, police said. Both had signs of trauma.

Investigators said Gary Crawford, 56, the woman’s son and Casdorph’s stepson, recently moved in with the couple and was missing along with their vehicle. Detectives also reported suspicious activity on one of Casdorph’s bank accounts.

Police found Crawford early Sunday in Glendale in the couple’s vehicle and arrested him without incident. During interviews, Crawford admitted to killing Casdorph and trying to kill his mother, according to police.

The woman remains hospitalized in critical condition.

Crawford was booked into the Maricopa County jail on charges including first-degree murder, attempted first-degree murder, fraudulent schemes, theft of means of transportation and tampering with evidence. His bond was set at $2 million.

Police said the case appears to be an isolated incident, and there are no outstanding suspects. The investigation is ongoing, according to police.