Naquian Robinson was with his longtime girlfriend at the Mall of Louisiana in February when he got down on one knee and asked her to marry him.

“It was like it was happening in slow motion, with everybody clapping,” said his fiancée, Sade Decay. “I was so happy.”

But the couple’s marriage plans were violently cut short Tuesday when Robinson, 19, was gunned down in the first Baton Rouge slaying of 2015.

Robinson was fatally shot about 3 p.m. during a robbery attempt in the 1900 block of Walnut Street, said Cpl. L’Jean McKneely, a Baton Rouge police spokesman, and was taken to a nearby hospital, where he died.

Baton Rouge police believe the gunman is a light-skinned black male who was last seen getting into a black Toyota Camry. No arrests had been made as of Wednesday evening.

Decay, 17, remembered Robinson as a loyal and “sweet-hearted” companion who could always make her laugh. The couple lived together at his grandmother’s house in north Baton Rouge, several blocks from where they first met when she was 12.

“I was walking with my mom and he smiled at me and said, ‘Hey, heartbreaker,’ ” Decay said.

Robinson took care of her, she said, noting the time her car broke down and he paid for the repairs.

“He took me to school every day in the meantime,” Decay said. “I just thought that was really sweet.”

They spent time together outside at local parks and lakes, she said, and ate out frequently, usually at Red Lobster or Joe’s Crab Shack. Robinson’s favorite food was cabbage.

The couple also liked to go on road trips to neighboring towns, weekend getaways where they would talk about their future together.

“We always talked about someday starting a business together,” she said.

Robinson, a Friendship Capitol High School graduate, also had plans to join the Army, Decay said.

He is survived by his father, Charles Brown; his uncle, Johnathan Brown; and his grandmother, Joyce Brown.

Anyone with information on this shooting is asked to contact the Violent Crimes Unit at (225) 389-4869 or Crime Stoppers at (225) 344-7867.

Follow Matt McKinney on Twitter, @Mmckinne17.