'I'll shoot you': Teenager committed robbery at a Waffle House and then shot a man to death at a convenience store

A teenager in Missouri will spend decades behind bars for a robbery and murder committed in two consecutive months last year.

On Wednesday, Undrellius Fleck, 18, was convicted of robbery in the first degree over an August 2025 incident in Clay County.

The defendant was subsequently sentenced to 30 years in prison.

Around 10:20 p.m. on the day in question, a man arrived at a Waffle House in Kansas City with his ex-girlfriend. At some point, the woman left, and the man followed her back out. Then came the defendant.

Love true crime? Sign up for our newsletter, The Law&Crime Docket, to get the latest real-life crime stories delivered right to your inbox.

Fleck approached the man, toting a gun, and the man ran, according to a press release issued by the Clay County Prosecutor’s Office.

“The victim fled back inside, jumped over the counter, and hid behind a waitress,” the press release reads. “The Defendant pursued him into Waffle House, pointed a black Glock handgun equipped with a tactical light at the victim, and demanded his cellphone.”

“Give me your phone,” Fleck shouted, according to court documents obtained by Kansas City-based CBS affiliate KCTV.

“Hurry up,” the defendant insisted, at one point pointing the weapon directly at the waitress’s chest, and saying, “I’ll shoot you.”

The victim eventually gave up his cellphone, police said, and Fleck fled the scene of the crime. The waitress would go on to tell law enforcement she thought she was going to die that night.

“One of the victims identified Fleck in a photo lineup,” the prosecutor’s press release continues. “Fortunately, no one was physically injured during the commission of the crime.”

Later, the victim’s ex-girlfriend would prove key in the case.

The day before the robbery, police in Kansas City stopped the woman’s gray Nissan Altima. During the traffic stop, she was on the phone, police said. The man she was talking to was allegedly Fleck.

In September 2025, Fleck was involved in a fatal shooting at a Kansas City convenience store in Jackson County, police said.

Just before midnight on that second night, the defendant arrived at the business in a gray Nissan, according to law enforcement.

Fleck was seen carrying a gun believed to have been illegally modified with a so-called “switch” device that turns a semi-automatic gun into a fully automatic weapon, police said.

A man later entered the store and was confronted by Fleck and a second defendant, according to law enforcement. When Fleck opened fire, the fusillade of bullets looked to be fully automatic.

The victim was hit several times and died at the scene while Fleck picked up the victim’s firearm and fled, court documents note.

In February of this year, Fleck pleaded guilty to counts of murder in the second degree and robbery over the convenience store shooting. He was sentenced in May to 23 years behind bars.

This week, his sentence for the Waffle House robbery was handed out and assessed to run concurrently, or at the same time, with his earlier sentence for the convenience store incident.

The post ‘I’ll shoot you’: Teenager committed robbery at a Waffle House and then shot a man to death at a convenience store first appeared on Law & Crime.