The suspect, 45-year-old Jason Brian Dalton, is set to appear in court Monday to face charges of murder, Kalamazoo County prosecutor Jeff Getting said.
Uber confirmed that Dalton was a driver for the ride-sharing company, adding he had passed a background check and had no criminal record.
‘We have reached out to the police to help with their investigation in any way that we can,’ Uber's chief security officer, Joe Sullivan, said in a statement.
Dalton was apprehended at 12:40 am local time Sunday (0540 GMT). Police are certain that he is the gunman who opened fire at three different locations in the city of Kalamazoo, killing six people and seriously wounding two others.
A woman was seriously wounded outside an apartment complex, two people were killed at a car dealership, and four more were shot dead at a restaurant, where a teenage girl was also seriously wounded.
Getting said Dalton surrendered without incident during a traffic stop.
There is ‘no reason to believe’ more than one person was involved in the crime, Getting said.
Dalton picked up and dropped off passengers between shootings, CNN reported, citing an unnamed source with knowledge of the investigation.
Investigators believe that Dalton was still looking for fares after the shooting rampage, the source said.
Local resident Matt Mellen said he was Dalton's passenger just a few of hours before the rampage began, and was taken on a hair-raising ride.
‘We were driving through medians, driving through the lawn, speeding along and when we came to a stop, I jumped out the car and ran away,’ Mellen told CBS affiliate WWMT.
‘He wouldn't stop. He just kind of kept looking at me like -- 'Don't you want to get to your friend's house' and I'm like, I want to get there alive.’
Mellen said he jumped out of the car at 4:30 pm, and called the emergency phone number 911. He told his fiancee what had happened and she posted Dalton's picture on Facebook as a warning to others.
‘We're looking into his connection to Uber and whether or not he was picking up fares in between the shootings,’ Kalamazoo Public Safety Chief Jeff Hadley said, according to CNN.
- 'Your worst nightmare' -
The shootings began at 6:00 pm Saturday.
‘What it looks like is we have somebody driving around, finding people and shooting them dead in their tracks,’ Kalamazoo County Undersheriff Paul Matyas told local media.
‘This is your worst nightmare, when you have somebody just driving around randomly killing people,’ he added.
The gunman's first victim was a woman who was with her three children outside an apartment complex when she was shot, he said.
She was seriously wounded but is expected to survive.
The gunman next struck at 10:00 pm, killing an 18-year-old boy and an adult male at a car dealership, according to Getting. Michigan Governor Rick Snyder said the victims were father and son.
The last and deadliest shooting came 10 to 15 minutes later at the Cracker Barrel restaurant where four more people were killed, according to Getting.
Security video at the dealership and the restaurant helped police identify the shooter's car, and Dalton was arrested about two hours later when a sheriff's deputy saw his car leaving a local bar in downtown Kalamazoo.
‘He followed the car. The Kalamazoo Department of Public Safety was able to mobilize people as a backup. They pulled the car over without incident. They were able to make an arrest of the suspect without any significant incident,’ Getting said.
Police seized a semi-automatic handgun and ‘additional evidence’ from the car, the prosecutor added.
Dalton is married and has two children, ages 15 and 10, neighbors told the Detroit Free Press newspaper. They described him as a ‘nice guy’ who sold insurance policies and was a hobby mechanic.
- 'Hearts are broken' -
Governor Snyder ordered flags lowered for six days starting Monday in honour of each of those killed, and met with relatives of hospitalized victims.
‘Our hearts are broken for the victims' families and friends, and I join in mourning their loss,’ Snyder said.
The Kalamazoo killings were the latest in a string of US mass shootings that include the December 2 massacre in San Bernardino, California that left 14 people dead, and the December 14, 2012 Sandy Hook school massacre that killed 26, including 20 children.
Gun violence claims the lives of about 30,000 Americans every year and mass shootings -- rare in most countries -- have been on the rise.
