Authorities say a Florida deputy fatally shot a man suspected of killing his ex-girlfriend.

A Broward Sheriff's Office news release says a veteran sergeant shot 43-year-old Ronny Santana Rodriguez, who was armed with a knife Wednesday at a Tamarac home.

The release says the ex-boyfriend killed 44-year-old Rosa Hilda Martinez and injured her new boyfriend. The new boyfriend was able to get three children and their grandmother out of the home to wait for deputies.

When deputies confronted the ex-boyfriend in the home, they first used a stun gun before using deadly force, according to authorities. The ex-boyfriend was taken to a hospital, where he died.

No deputies were injured.

Sheriff's Office detectives are investigating the woman's death. State law enforcement officials are investigating the deputy-involved shooting.