Deputies with MCSO got a call at about 7:15 p.m. to conduct a welfare check at a residence in the 22000 block of Linden Lane in Magnolia, Texas.
Deputies were informed that a man had suffered a gunshot wound to the chest and was able to call the police to report the incident.
The wounded deputy was taken to a nearby hospital where he is said to be in stable condition.
An investigation into the shooting revealed that the injured man was an off-duty Harris County Sheriff's Office deputy who accidentally shot himself in his own home.
The circumstances surrounding how the deputy shot himself are currently under investigation, authorities said.