Dead Bang

Dead Bang is a 1989 action film directed by John Frankenheimer and starring Don Johnson. Johnsons character, based on reallife LASD Detective Jerry Beck, tracks the killer of a Los Angeles County Sheriffs Deputy and uncovers a plot involving hate literature, white supremacist militias and arms trafficking. The cast also includes Penelope Ann Miller, William Forsythe, Tim Reid, Bob Balaban, and Michael Jeter. Filmed in Calgary, Alberta.

The slain officers widow further complicates the issue when she entices Beck into a onenight stand, in the hope that Beck will not only find but kill her husbands murderer. During the investigation Beck learns that the murder of the deputy sheriff was just the tip of the iceberg, as he finds the roots of the suspect are in a White Supremacist, NeoNazi group.Detective Beck pursues the killer across several states and uncovers that the killer is involved with a White Supremacist, NeoNazi group that is involved in many violent crimes. Eventually Detective Beck tracks the killer to a NeoNazi compound in rural Colorado. Beck, with the assistance of a local police chief and his officers, corners the killer in an underground tunnel complex concealed under the neonazis compound. Beck kills the suspect with his .357 Colt Python revolver in a shootout when the killer fires on Detective Beck and the local police with a 9mm Browning HiPower pistol. ........

Source: Wikipedia