Brinkman was also Facebook friends with Suzanne Taylor, the North Royalton woman found slain in her home - along with her two daughters - on Sunday.
Brunswick Police Lt Robert Safran says a stun gun was used to subdue the man, who had a handgun.
OH police said on Tuesday that a 45-year-old man arrested that morning is a suspect in both the triple homicide of a mother and her two adult daughters, who were found dead on Sunday, and the fatal shooting of a couple found dead on Monday.
Sheriff Maier said the police think that the three women killed in North Royalton, Ohio, were murdered before the Johns were killed in Lake Township. The standoff began around 9 p.m. Monday at a Brunswick, Ohio, home, the Brunswick Division of Police said at a news conference this morning.
A 911 call from Suzanne Taylor's boyfriend, Scott Plymale, prompted the police to respond to her home. He is accused of murdering Suzanne Taylor, 45, and her daughters, Kylie Pifer, 18, and Taylor Pifer, 21, of North Royalton. Authorities say they apparently were shot.
North Royalton Det. Dave Loeding told WOIO that evidence found at the scene of the crime was sent to the lab.
The sheriff says the couple was killed after the three women were killed in North Royalton.
On Sunday, June 11, authorities were called to a North Royalton, Ohio, home on reports of a triple homicide.
He was arrested Tuesday after an overnight standoff with police in Brunswick.
Taylor Pifer attended Kent State University for study in fashion.
Brinkman barricaded himself in a home with an unlocked door, which is how SWAT entered.
Officials said George Brinkman dated the Johns' daughter and previously worked at their family business. He reportedly knew the residents there, and one woman was present when he arrived, but she escaped unharmed.