Sam Hanna identifies that the ammunition and weapons used are the same as those found on the streets of Iraq.

Gunnery Sergeant Wendell is killed by gunmen wielding AK-47s in a drive-by shooting on a Los Angeles sidewalk.

Operational Psychologist Nate Getz spends time with James and also identifies a primary antagonist, Rashad Hollander (also known as "Slide"), a dishonorably discharged Army veteran who Nate believes is becoming a sociopath.

Technical Operator Eric Beale links the evidence to a local black street gang. The investigation leads to an operation smuggling automatic weapons from Iraq to dangerous local gangs. Key Developments

The story of , titled "Blood Brothers," focuses on the team's investigation into the drive-by shooting of a Marine gunnery sergeant, Wendell. Case Investigation

After a final intense gunfight, James makes a significant confession to Callen, and the team successfully pieces together the smuggling ring and identifies those responsible for Wendell's death. "NCIS: Los Angeles" Blood Brothers (TV Episode 2010) - IMDb