The unarmed man was being pursued by a Dearborn officer Wednesday, we're told the two struggled before the officer opened fire.
Tonight we're learning more about Matthews including his battle with mental illness.
"No justice, no peace" is a now familiar refrain. But now it's in the name of 35-year-old Kevin Matthews of Dearborn.
"Something's going to happen," said Lavell Matthews, his brother. "They took my brother and he's harmless and they took him. they shot him like a dog."
Matthews was spotted on Wednesday afternoon by a Dearborn police officer, wanted for a misdemeanor theft out of Redford Township.
The officer gave chase into a Detroit neighborhood along the city border, where Matthews was shot and killed.
"There was a struggle over the officer's gun and it was a fatal shooting," said Dearborn Police Chief Ronald Haddad.
Less than 24 hours later, the family along with local leaders from the National Action Network, are demanding answers.
"We want justice and we are going to fight this all the way," said Kimberly Matthews, his sister.
The 35-year-old suffered from paranoid schizophrenia and was prescribed medication.
He was known to officers in the area. Police say he was wanted for a probation violation and a theft in Dearborn earlier that day.
His mother says when his illness would take hold, he would be brought to her home.
"I love my son and he loved everybody," said Valerie Johnson. "And my son was on his way to see about me when he was shot down."
Detroit police are now handling the investigation. The Matthews family is finding hard to handle anything at the moment.
"Instead of wrapping presents with my baby, I have to bury my brother," Kimberly said.
The crime scene tape on Whitcomb is gone but there are many questions which remain.
The National Action Network is staging a march outside the Dearborn Police Department in January.