Investigators who met with 21-year-old Deputy Angel Reinosa "saw no visible injury to Reinosa's shoulder", department officials said.
Reinosa had claimed he was shot at from an apartment building while walking to his personal auto, the Sheriff's Department said. The rifle and Reinosa's uniform, which shows damage consistent with a gunshot in the top right shoulder, will be sent to a crime lab for forensics testing, according to officials.
"There was no sniper, no shots fired, and no gunshot injuries sustained to his shoulder", Los Angeles County Sheriff's (LASD) Homicide Bureau Capt. Kent Wegener told reporters at a news conference on Saturday night.
Much of the young deputy's statement "was self-serving and didn't make a whole lot of sense", Wegener said.
Mr Reinosa eventually admitted making up the story and using a knife to cut the two holes in his shirt.
The investigation is ongoing and the sheriff's department plans to present the case to the Los Angeles District Attorney's Office for consideration of charges that could include false reporting of an emergency, the captain said. Reinosa had earlier said he was saved by the ballistic vest he was wearing.
The deputy claimed he was shot while walking to his vehicle from the sheriff's station in Lancaster in northern L.A. County.
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It is unclear why the deputy made up the story about getting shot.
"Our deputies responded to a cry for help and did exactly what they have been trained to do to protect our civilian staff, residents and community", said a department statement Sunday.
Parris said a sheriff's official called him about 9 p.m. Saturday to tell him investigators had confirmed that night that the shooting was a hoax. "Our community and other first responder partners worked side by side with us to move quickly, effectively and efficiently".
Capt. Kent Wegener speaks to reporters at a press conference in Los Angeles, on August 24, 2019.
The Lancaster station tweeted that is was "saddened by the outcome of the investigation" and that "one individual doesn't represent who we are". He didn't explain his motive.