John Francis Dillon

Lost, from Wiki:

The only known surviving fragment is a 20 second long clip found in 2023. The large amount of Pre-Code content, which raised alarm even before the Code began to be enforced (in 1934) may have contributed to the film's disappearance as this would have made the film unacceptable for Associated Artists Productions in 1958 when a number of early Technicolor features were transferred to black and white film. The soundtrack, which was recorded on Vitaphone disks, survives intact.

Lost film with only the Vitaphone tracks surviving