Harlan James Drake, 33, was taken to a hospital with a self-inflicted wound near his wrist, Shiawassee County Prosecutor Randy Colbry said. He didn't know exactly when Drake was transported or what he used to cut himself.
"He attempted suicide. It sounds like he's going to make it but it's a serious gash, a very serious wound to his arm," Colbry said.
Drake, 33, was charged with two counts of first-degree murder Friday. Hours earlier, well-known local abortion protester, James Pouillon, 63, was killed in a drive-by shooting near Owosso High School and the owner of a gravel company, Mike Fuoss, 61, was fatally shot at work.
Authorities said Owosso real-estate agent James Howe was a third target, but Drake's capture at home ended the spree.
Investigators have said Drake had a "grudge" against Fuoss and Howe and didn't like Pouillon's graphic anti-abortion signs. Fuoss' family has said Drake's mother worked at the gravel company years ago.
Sara Edwards, chief assistant prosecutor, said Saturday that the mother also had done some work for Howe.
"I don't know how that would lead to the grudges," Edwards said. "We have connections but we haven't gotten to the root of it. That's what we'll be working on in the days ahead."
Drake occasionally stayed at his family's home, a converted old commercial building, when he wasn't driving a truck across the country. No one answered the door Saturday.
Howe said his family was upset after police told him he was an intended target of the Friday shooting spree. He hesitated when asked how he was dealing with the allegations.
"How would you hold up if someone was told you were going to be killed?" said Howe, who spoke to The Associated Press by cell phone. He declined to discuss Drake or say where he and his family were staying.
"I'm not making a whole lot of statements. ... I need some privacy," Howe said.
Drake was arraigned Friday without an attorney on first-degree murder charges and ordered held without bond.
On Saturday, roses, daisies and gladiolas marked the spot where Pouillon was shot. A note said, "May you rest now."
The retired autoworker protested for years all over Owosso, holding up signs with pictures of aborted fetuses. His shooting was a hot topic at a garage sale just a few houses away from his last demonstration.
"I'm sorry the students had to witness it," said Cindy Randt, 74.
A Michigan-based group, Citizens for a Pro-Life Society, planned to hold a prayer vigil Sunday at the site where Pouillon was killed. St. Joseph Catholic Church, where Pouillon was a former member, was collecting money to help pay for funeral services.
"He stood out in the rain, the sleet and the blistering heat to protect the unborn," said the Rev. David Fisher.