Hill who ran his team alongside the Shadow works team. For the 1974 season, the team hired two of the most promising drivers of the time: American Peter Revson and Frenchman Jean-Pierre Jarier. During a practice run for the 1974 South African Grand Prix, Revson was killed by a suspension failure on his DN3 car. He was replaced by Tom Pryce. 1975–1977: Peak of success The new DN5 driven by Jarier gained pole position in the two first Grands Prix of the 1975 season but suffered mechanical failure in both races. The DN5 and most other Shadow Formula One cars used Ford Cosworth DFV engines, which produced around 490 bhp. However, later in 1975, another car was driven by Jarier, the DN7, and was fitted with a Matra V12 engine producing around 550 bhp. The wheelbase was substantially lengthened to accommodate the much larger and more expensive French powerplant, although due to budgetary issues, the Matra-powered DN7 was doomed as a one-off. Jarier's new teammate, Pryce, won the non-championship Race of Champions that same year. Pryce died in an accident involving a marshal at the 1977 South African Grand Prix. The marshal, Frederick Jansen Van Vuuren, had been running across the track to put out a small fire on the other Shadow car and Pryce was unable to avoid the collision because he was un-sighted behind the March of Hans-Joachim Stuck. Pryce struck Van Vuuren at speed and was hit on the head and killed by the fire extinguisher Van Vuuren was carrying. Before Pryce's car finally came to a stop it hit Jacques Laffite's Ligier resulting in both cars crashing into the barriers. Van Vuuren's injuries were so severe that he could initially only be identified by his absence from a marshal's meeting after the accident. The team replaced Pryce with Alan Jones, who won the team's only Grand Prix at the Austrian Grand Prix the same year. 1978–1980: Decline After the 1977 season Shadow entered into a sharp decline. Jones left to join Williams for 1978. In the same period a majority of their staff and their sponsor Franco Ambrosio left to form their team, Arrows, taking the young Riccardo Patrese. Despite sponsorship from Villiger tobacco and the signing of experienced drivers Clay Regazzoni and Hans Stuck for the 1978 season, results were poor. In 1980 they were absorbed into Theodore Racing, but Shadow's first ground effect chassis