Vitarelli was signed by the Rochester Knighthawks in December 2010, while playing his final season of college hockey at the University of Prince Edward Island with the expectation that he would join the Knighthawks after his team's hockey season concluded.[2] After an unexpected early exit from the playoffs by his college hockey team, Vitarelli made his NLL debut with the Knighthawks on March 26, 2011, scoring 2 goals and assisting on another.[3] He followed that up in his second game a week later with a hat trick. Vitarelli finished his brief 2011 regular season with 7 goals and 6 assists in 6 games played. The Knighthawks won 5 of those 6 games. Vitarelli made his NLL playoff debut with the Knighthawks on May 1, 2011 in a 10-8 loss to the Toronto Rock.
Vitarelli's career-highs for regular-season goals and points came in 2012, when he had 29 goals and 46 points. His career-high for regular-season assists is 19 in 2013.
Vitarelli was a member of the Knighthawks three consecutive Champion's Cup winners in 2012, 2013 and 2014.
GP–Games played; G–Goals; A–Assists; Pts–Points; LB–Loose balls; PIM–Penalty minutes; Pts/GP–Points per games played; LB/GP–Loose balls per games played; PIM/GP–Penalty minutes per games played.