A 52-year-old man is wanted by Baton Rouge Police in the fatal shooting of his 41-year-old ex-girlfriend, who died late Saturday after he ran up behind her as she exited her vehicle and opened fire, a police spokesman said.

Robert Antoine, of 4665 Shelley St., is accused of killing Monique Maxie about 1:30 a.m. Saturday in the 1900 block of Blount Road, said Baton Rouge Police spokesman Sgt. Don Coppola. A warrant is out for Antoine's arrest and he is considered armed and dangerous, Coppola said.

The couple had recently broken up after dating for about a year riddled with incidents of domestic abuse, said Maxie's mother, Wanda Young. Maxie would often come to Young's house after an incident where Antoine had gotten out of hand.

"She just chose the wrong person," said Ashiya Gross, one of Maxie's sisters. "I never liked him from the start."

Gross said their family — and other people — had tried to convince Maxie that Antoine was bad news.

"People she didn't know who knew him, they tried to tell her that he was a bad person," said Niette Maxie, another sister of the victim. "We couldn't choose for her, she had to find out."

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Niette Maxie said she had worried for her sister because Antoine had been incarcerated and arrested in the killing one of her classmates in 1998.

Antoine was accused of fatally shooting a 22-year-old man after a game of dice, according to stories published in The Advocate. Antoine was neither indicted nor cleared on that second-degree murder charge after a grand jury hearing. However, a month later he was convicted of attempted possession with intent to distribute cocaine and sentenced to 15 years, newspaper records show.

"We've been hearing that he's saying he's not done yet, he's still riding around," Gross said. The family hopes police can arrest Antoine soon.

Monique Maxie was a mother of two sons, ages 18 and 8, and worked as a direct care professional for people with intellectual and developmental disabilities in group homes, the family said. In her spare time, she loved to ride dirt bikes and especially horses. Maxie owned her own horse and loved to go riding on trails and at rodeos, the family said. 

"She just had to have that cowgirl look, that diva cowgirl look," said Niette Maxie, laughing. 

Niette Maxie and Gross were at a party with their sister Friday night, and both were concerned when Antoine showed up. Monique Maxie left the party early Saturday with a friend, Gross said.

According to police, when Monique Maxie and the friend exited the vehicle, Antoine fired multiple shots at them, but only hit his ex-girlfriend, mortally wounding her.

Monique Maxie spent almost 20 hours fighting for her life in the hospital from the bullet wounds before she died late Saturday, her family said as they gathered outside of their mother's house Sunday afternoon.

"She just liked to enjoy life," Young said, tearing up as she remembered her daughter. "She was a good person, she had friends that loved her, she had beautiful smile, she was just beautiful."

Antoine is wanted on counts of second-degree murder, aggravated battery and illegal use of a weapon. Coppola asked that anyone with information on Antoine’s whereabouts to contact the Violent Crimes Unit at 225-389-4869 or Crime Stoppers at 225-344-7867.

EDITOR'S NOTE:  This story was modified on Monday, July 17. The original version incorrectly reported Monique Maxie died 8 hours after the shooting. In fact, she died 20 hours later. The Advocate regrets the error.

Follow Grace Toohey on Twitter, @grace_2e.