"Within three weeks of the shooting, Merseyside Police had identified the defendants as suspects, the Crown Prosecution Service had authorised murder charges and all three were before the court.
Rikki Berry, 36, died after he was shot three times by Michael Smith, 27, who was riding an electric bike while wearing a balaclava.
Williams and gunman Smith must serve at least 31 years in jail before they can be considered for release, while car passenger Walsh must serve at least 30 years.
The court heard all three killers were involved in Class A drug dealing, and Walsh and Smith had both worked for Williams at various points.
Telephone evidence showed the three men were in contact with each other in the run-up to the murder, and were all together in the black Cupra Ateca car minutes before the shooting.
