Mackenzie Rose Colgan, 37, of Chevy Chase, was arrested Sunday after police and firefighters responded to her residence in the early afternoon for reports of a pediatric drowning.

MacKenzie Colgan told detectives that she “turned the baby to face away from her” and held the child down until she knew the infant was dead, detectives asserted in the court filings.

Battlefield's Aayla Burgo, Colgan's Chase Rooney, Colgan's Bree Bridges and Gainesville's Kyah Smith named to Class 6 ...

Mackenzie Rose Colgan faces a first-degree murder charge related to the Sunday, Dec. 8, death of her infant, the Montgomery County Department of Police said in a press statement on Monday.

MacKenzie Colgan told detectives that she “turned the baby to face away from her” and held the child down until she knew the infant was dead, detectives asserted in the court filings.

Mackenzie R Colgan, 37, called 911 on Sunday from her home in Chevy Chase, Maryland, to report that she had drowned her infant daughter in the bathtub, Montgomery County Police Department said.

Mackenzie Colgan told detectives she had a plan to kill herself and her family. Court documents are offering chilling details after a 3-month-old girl was found dead in a Chevy Chase home.

According to charging documents, 37-year-old Mackenzie Colgan told police she woke up Sunday morning with a plan to “end everything” and kill herself, her husband and two children.

What to Know. Mackenzie Colgan, 37, told police she had woken up in the morning with a plan to “end everything” by killing her husband, her two children and herself, according to court documents.

What to Know. Mackenzie Colgan, 37, told police she had woken up that morning with a plan to “end everything” by killing her husband, her two children and herself, according to court documents.