LOS ANGELES (CBS) — Scotty Dugan, 52, reportedly collapsed and died on his way to the funeral of John Atterberry, the music industry executive and film producer killed by gunman Tyler Brehm in Hollywood on Dec. 9.

According to The Hollywood Reporter, Dugan was informally handling publicity for “God’s Country,” the Christian-themed film Atterberry was working on when he was killed.

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Witnesses reportedly saw Dugan reach for his head in pain, then collapse on the ground while waiting for an MTA train Wednesday. He was said to be en route to Atterberry’s funeral in South Los Angeles.

Dugan was pronounced dead at Providence Saint Joseph’s Hospital in Burbank. THR says the LA County Coroner has yet to examine Dugan’s body to determine a cause of death.

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Dugan reportedly had his own publicity company, representing clients such as Barbara Streisand and Charleton Heston. Dugan also represented Jenn Gotzon, the star of “God’s Country.”

Gotzon told THR of Dugan, “He was the inspirational backbone of my career. Everything I’ve basically gotten has been from Scotty’s belief in me.”

Atterberry, known for working with music acts such as Jessica Simpson and the Spice Girls, was shot in the jaw during a Hollywood shooting spree on Dec. 9 that ended in the death of gunman Tyler Brehm, 26.

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Atterberry died Dec. 12 at Cedars-Sinai Medical Center in Los Angeles. He was 40-years-old.