Table:
text: List of Los Angeles Police Department officers killed in the line of duty
Officers
Officers
Rank_ Badge_Serial_Number Tenure Date_of_death Cause_of_death
Reserve Policeman — — 1946-08-07 Gunfire
Policeman 7605 — 1947-04-04 Gunfire
Policeman 3641 — 1947-10-07 Motorcycle accident
Policeman 3757 — 1947-12-05 Gunfire
Policeman 3378 — 1948-12-06 Gunfire
Detective Sergeant 1364 21 years 1949-05-16 Gunfire
Policeman 5049 3 years 1950-05-11 Gunfire
Policeman 3277 — 1950-07-08 Motorcycle accident
Policeman 5043 — 1950-10-21 Motorcycle accident
Policeman 4602 — 1951-04-05 Motorcycle accident
Policeman 4230 — 1951-09-30 Motorcycle accident
Sergeant 3969 — 1952-02-15 Gunfire
Policeman 2942 — 1952-03-03 Car accident
Policeman 3975 — 1952-08-24 Motorcycle accident
Policeman 4350 — 1954-06-22 Car accident
Detective 1007 — 1955-02-22 Car accident
Policeman 4227 10 years 1956-09-07 Motorcycle accident

Question: What is the cause of death of the officer with the death date 1956-09-07 on the Los Angeles Police Department's list of officers killed in the line of duty?