Martineau Murdered Girlfriend in May 26 Attack, Police Say

A second-degree murder and second-degree domestic assault charges were filed Friday against Steven John Martineau, 48, of the 400 block of Tower Grove in St. Charles.

Martineau is 50, who died June 10 from her injuries.

St. Charles Police said Martineau and Cerutti argued at their home 400 block of Tower Grove Place in St. Charles. During the argument, Martineau attacked Cerutti, beating her into unconsciousness, police said.

She never recovered from her injuries and died 15 days later.

According to a news release, investigators used inconsistencies in Martineau’s account of how Cerutti sustained her injuries and information from other sources to develop the case.

Martineau has been held on misdemeanor charges of third-degree domestic assault on Cerutti in a February. He is being held in St. Charles County jail in the St. Charles County Jail in lieu of a cash-only bond of $50,000 since the incident in May.

Martineau was held on an outstate warrant from Michigan involving child support charges.

Anyone with additional information in reference to this incident or similar incidents is requested to contact the St. Charles Police Department at 636 949-3300 or can do so anonymously at 636 949-3333, via e mail at stcharlescrimestoppers.org, or text STCPD plus your message to 274637 (CRIMES).

If you have experienced or know someone who has experienced domestic or sexual violence, find resources through the St. Louis Ending Violence Against Women Network (SLEVAWN) or call the Safe Connections 24-hour crisis hotline at 314 531-2003.