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A suspect in a double homicide in Rock Island was being held Monday night in the Scott County Jail on a $5 million cash bond.

John Patrick Conwell, 39, was arrested Monday afternoon after Rock Island police officers located him in the area of 2nd and Ripley streets in Davenport. Davenport police took Conwell into custody without incident about 1:46 p.m.

Conwell was arrested on two charges of first-degree murder, a Class M felony.

Police were called at 7:54 p.m. Sunday to the 1200 block of 29th Street for a welfare check.

Eleanor M. “Petty” Conwell, 90, and Steve D. Conwell, 69, were found dead inside the residence. Public records list Stephen Conwell‘s address as 1208 29th St., Rock Island.

The middle-class neighborhood, which includes some single-family houses as well as apartments, was quiet Monday afternoon after hours of police activity into the early-morning hours of Monday.

Sarah Fetes, of Moline, is a second cousin to Steve Conwell and the great-niece of Eleanor Conwell. The suspect, she said, is the grandson of Eleanor Conwell and the nephew of Steve Conwell.