A 53-year-old Good Samaritan trying to catch thieves who ran off with a Starbucks tip jar is clinging to life Tuesday after the suspects hit him with their car, the St. Louis Post-Dispatch reported.

A woman described as between 16 to 19 years old, walked into the Starbucks around 3 p.m. Monday and bought a drink, and walked out to the parking lot. The 20-year-old man she was with grabbed the tip jar and ran, the newspaper reported.

The man, who police said was a regular customer, saw the incident and ran after the man.

"The car door was open, they sped off and he gets run over," Capt. Rick Downs of the Crestwood police told the newspaper. "He ended up underneath the car."

An anonymous donor, as well as Starbucks, each put up a $10,000 reward for information leading to the arrest and conviction of the suspects.

Click here to read more on this story from the St. Louis Post-Dispatch.