More details in the case were released Monday, including the names of the victims and suspect. The Dane County coroner identified the suspect as Londrell Emone Johnson and the victims as 57-year-old Robin Rae Grossmann and her daughter, Charity Rae Grossmann, 34.
Online court records indicate that Johnson, 33, had been convicted of multiple counts of disorderly conduct. He pleaded guilty to the charge most recently in 2013 and again in 2008, and pleaded no contest to it in 2010 and twice in 2000. He also had convictions for intent to contribute to the delinquency of a child.
Police have said he had suffered from mental illness and threatened neighbors in the past.
On Friday, Johnson forced his way into the apartment where Robin Rae Grossmann lived with her 20-year-old son, police said. He fatally stabbed Grossmann and her daughter and wounded the son, they said. The son's name has not been released.
One or more Madison police officers shot Johnson, who was wielding a knife when officers arrived at "a very fluid and active scene," police spokesman Joel DeSpain said. He was taken to a hospital, where he died.
The two women died after being attacked. The 20-year-old man who was wounded suffered multiple stab wounds but was able to escape and is expected to survive, police said. He was able to run for help "indicating a neighbor was stabbing his family," according to a police report.
Police said Charity Grossmann was at her mother's apartment baby-sitting a 4-year-old boy when the stabbings happened. DeSpain said the child, who was unharmed, was found hiding inside the apartment after the attack and has since been reunited with family members.
The Wisconsin Department of Justice's Division of Criminal Investigation is taking the lead on looking into Johnson's death and how police handled the situation. Madison police are investigating the killings.
Justice Department spokeswoman Dana Brueck released a statement that said special agents are conducting an "open and ongoing" investigation. The reports from that probe will be turned over to the Dane County district attorney for review. It's not clear how soon that will occur.
Johnson's death is one of the first in Wisconsin to test a law that took effect April 25 requiring all officer-involved deaths to be investigated by an independent agency.
Milwaukee police last week killed 31-year-old Dontre Hamilton after officers say he struck one of them in the head with a baton. Police Chief Ed Flynn said Hamilton suffered from schizophrenia and DCI is leading the investigation into the death.
Dane County sheriff's deputies also killed a man in the town of Primrose last week after police say he beat his mother and stepfather and stabbed two responding officers. That man, identified as 50-year-old Dean A. Caccamo, also suffered from schizophrenia, police said. A Madison police detective is heading the investigation as part of the new law, sheriff's spokeswoman Elise Schaffer said.