The University of CT student who's alleged to have killed two people and injured a third was taken into custody in Maryland Wednesday night, police said.
The victim was later found unharmed in Paterson, New Jersey, and identified Manfredonia, police said.
"We know that this suspect will face justice", Connecticut State Police Trooper First Class Christine Jeltema said Wednesday night.
The family expressed their condolences to the loved ones of the victims as well.
Through the course of the hunt for Manfredonia, police have said he was armed and unsafe.
Pennsylvania police said Manfredonia was spotted at a gas station in Chambersburg Tuesday morning along with a stolen vehicle that was seen in Manfredonia's last known location. A man matching Manfredonia's description was picked up by a surveillance image at the cash register of a gas station there.
He allegedly took an Uber cab from the store to Hagerstown, roughly 25 miles away, police said. Though the motive is still unclear, he is suspected of two killings, one injury, an abduction and a home invasion over the weekend.
"If seen, do not approach".
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He is 6 feet 4 inches tall and weighs 240 pounds, and is considered armed and unsafe. He was seen with the same bag at the Chambersburg store, state police said.
The investigation began last Friday and involved investigators from four states and the FBI so far.
In Derby, police found Manfredonia's high school friend, Nicholas Eisele, 23, shot to death in his home on Sunday.
On Sunday, police said, Manfredonia went to another home in Willington and stole firearms and a truck. The girlfriend was found unharmed with her auto at a rest stop on Interstate 80 in Columbia, New Jersey, police said. Police discovered through interviews with the driver and from security camera footage that Manfredonia walked behind the store and onto railroad tracks, authorities said.
Peter Manfredonia, 23, was taken into custody Wednesday at a truck stop in Hagerstown, Md., near the Washington County Sheriff's Office after a six-day manhunt and was brought to the detention center around 2 a.m.
Hagerstown police alerted residents and cautioned against answering the door to strangers.
Family attorney Mike Dolan had asked Manfredonia to turn himself in during a Monday press conference.