In , Ayrton Senna joined Hill at Williams. As the reigning champion, this time Prost, was again no longer racing, Hill retained his number '0'. The pre-season betting was that Senna would coast to the title, but the Benetton team and Michael Schumacher initially proved more competitive and won the first three races. At the on 1 May, Senna died after his car crashed into a concrete barrier while he was leading. With the team undergoing investigation from the Italian authorities on manslaughter charges, Hill found himself team leader with only one season's experience in the top flight. It was widely reported at the time that the Williams car's steering column had failed, though Hill told BBC Sport in 2004 that he believed Senna simply took the corner too fast for the conditions, referring to the fact that the car had just restarted the race with cold tyres after being slowed down by a safety car.