A contestant on Erica Mena‘s reality dating show was fatally shot in St. Louis … and prosecutors have already charged a man with murder in connection with the death.

“Two Ways With Erica Mena” contestant Pee Wee was found shot early Wednesday morning and he died at the scene … according to the St. Louis Metropolitan Police Department.

Pee Wee — government name Jardyn Walker — had been reported missing Tuesday night and was last seen delivering packages for his job in the University City area … according to the University City Police Department.

Law enforcement says Pee Wee was found in an alley near where his cell phone was pinging in the city’s Central West End … and police connected the shooting to an earlier call for shots fired.

Police say when they responded to the shots fired call Tuesday night, they saw a car quickly leaving the area … officers stopped the car and found 27-year-old Jamaal Jones inside the car, armed with a weapon … and he was arrested.

Prosecutors have since charged Jones with first-degree murder, armed criminal action and tampering with evidence in connection to Pee Wee’s death … and we have obtained his mug shot.

Pee Wee competed for Erica’s love on her Zeus Network reality dating show … and Erica is taking to Instagram to remember him.

She posted several Instagram Stories with photos of Pee Wee along with emojis of broken hearts and doves … she also wrote, “I’m so sorry” and “Crushed.”

His costar Celina Powell tells TMZ … “Peewee was genuinely such a light on the show, kept everyone laughing & really kept in touch with everyone once filming wrapped. He was always meant to be a star, my heart really goes out to his family and loved ones 💔”

Pee Wee was just 23.