Milwaukee authorities have identified the 25-year-old mother and her 7-year-old daughter who were found dead Thursday in Northridge Lake.

Khalilah S. Brister, 25, died by suicide, according to a report from the Milwaukee County Medical Examiner's Office.

The cause of death listed for her daughter, Tyrielle Jefferson, is homicide.

Brister and Tyrielle were found dead Thursday in a car submerged in Northridge Lake, located just across from the former Northridge Mall at North 76th Street and West Brown Deer Road.

Their deaths come after Brister's mother called 911 about 4:30 p.m. Wednesday to report that Brister was possibly suicidal and threatening to drive a car into "the lake," according to a timeline of events provided by the Milwaukee County Sheriff's Office.

Sheriff's deputies responded to Bradford Beach at Lake Michigan, but before they arrived, the Milwaukee County 911 dispatch center got word that Brister and her daughter had left, according to the sheriff's office timeline.

The dispatch center asked the deputies en route to turn around. Dispatchers planned to transfer the call to an agency in another jurisdiction, where witnesses believed Brister was headed. According to a Monday statement on behalf of the Office of County Executive David Crowley, the Brown Deer Police Department was notified that Brister may have been entering their jurisdiction.

One sheriff's deputy did continue heading to Bradford Beach, according to the timeline, but did not find Brister and her daughter. It was not immediately apparent what other agencies did to search for Brister and her daughter.

"Once a disposition is provided, it is standard best practice for dispatch to advise additional,voluntary squads that they can return to or remain in service," the statement on behalf of the Office of the County Executive said. "This does not serve as a cancellation of the call in its entirety. Responding law enforcement personnel dictate all investigative actions and follow-up regarding a call for service. OEM’s 911 Communications Division dispatchers at the call center cannot, and do not, supersede the judgement of the investigating deputy on the scene."

Brister's mother called the sheriff's office on Thursday to report she had not heard from her since 4:30 p.m. Wednesday.

As sheriff's office investigators began to help Brister's mother search for her daughter, someone called to report seeing the vehicle in Northridge Lake. Divers pulled the bodies of Brister and Tyrielle from the water.

The Milwaukee Police Department is investigating the deaths.

"On behalf of the County Executive our hearts go out to the families and friends of the victims of thetragedy," the statement said.

Where to find help

Milwaukee's Office of Violence Prevention recommends these resources for free support:

National Suicide Prevention Hotline: 800-273-8255.

Milwaukee County's 24-Hour Mental Health Crisis Line: 414-257-7222.

Milwaukee's Child Mobile Crisis and Trauma Response Team: 414-257-7621.

414Life outreach and conflict mediation support: 414-439-5398.

National crisis text line: text HOPELINE to 741741 to text with a trained crisis counselor.

The National Domestic Violence Hotline is 800-799-7233.

This article originally appeared on Milwaukee Journal Sentinel: 911 calls preceded deaths of Milwaukee woman, daughter, 7, in lake