Surveillance video shows Lane Garrison slapping Ashley Mattingly square in the face after he waited for her outside her apartment -- a much different story from the one Lane told his attorney after his arrest for domestic violence.
A copy of the building security camera recordings from Saturday ... and the full video shows the "Prison Break" star sitting outside his ex-gf Ashley's Beverly Hills apartment building until she arrives home.
When Ashley drives into the building's garage, Lane is seen stumbling as he runs after her.
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