[2] He scored his first goal for Hamilton against Dundee in April 2008,[3] but returned to Northern Ireland having made only 10 appearances during eight months in Scotland.

However, he eventually made his league debut for Linfield on 14 September 2013, scoring a hat-trick in a 4–1 win against Ballymena United at Windsor Park, and went on to score 11 goals in his first eleven league appearances to put his side top the table.

[8] His first trophy with the Blues arrived in the form of the 2013–14 County Antrim Shield, after a penalty shoot-out victory over Crusaders in the final.

Waterworth made his Glenavon debut coming on as a sub in a 1–1 draw with Portadown, and scored his first goals for the club a week later, notching a brace in a 6–1 victory over Warrenpoint Town.

[11] On 16 March 2023, it was announced Waterworth would take charge of the Northern Ireland women's team on an interim basis.