Kilduff scored 8 league goals in 35 appearances and was voted the club's Player of the Year as well as finishing as their top scorer.

In August 2011, Kilduff played an important role when coming on as a substitute against Partizan Belgrade in the Europa League play-off round victory.

His parried shot led to a winning penalty for his team as Shamrock Rovers became the first Irish side to reach the group stages of either of the top two European competitions.

In August 2012, Kilduff signed a new deal to keep him contracted at Shamrock Rovers until the end of the 2014 season[15] and in May 2013, he won his second Setanta Sports Cup.

Following the expiry of his contract at Shamrock Rovers, Kilduff signed a two-year deal for city rivals, St Patrick's Athletic on 11 November 2014.

[20] He made his debut for the club in a 7–0 win against Tolka Rovers in the Leinster Senior Cup on 9 February 2015 at Richmond Park, coming off the bench in the 68th minute to replace Christy Fagan and scoring two goals .

[28] In 2016, however, he suffered a major setback when he fractured his vertebrae in an accidental collision with St Patrick's Athletic goalkeeper Brendan Clarke.

He spent 10 days wearing a back brace that left him housebound and unable to move to the extent that he wasn't even allowed to have a shower.

[29] He expected to spend the season on the sidelines but with the help of the Dundalk medical staff he returned after only six weeks to play against St. Patrick's Athletic.

[30] He was rested for the following game which allowed David McMillan to kick off a goal-scoring streak and cement his place as first-choice striker again.

Kilduff had hoped to play against Legia Warsaw in the Champions League play-off round but missed out due to a serious knee complaint.

[36] His achievement of scoring in such a high-profile match against the backdrop of his recent recovery from serious injury saw him named the Irish Independent Sports Star of the Week on 22 September 2016.

[38] Having come on as a substitute in the 64th minute, he latched on to Daryl Horgan's 72nd-minute cross to tap home the winner against Maccabi - a goal that is worth €360,000 in UEFA prize money.

[50] On 20 October 2024, his side were defeated 6–1 by Shelbourne in the FAI Women's Cup Final, with Kilduff announcing he was stepping down as manager of the club after the game.