Dick’s Sporting Goods has filed a lawsuit against Paul Gaffney, its former chief technology officer who joined Kohl’s in September. The lawsuit charges Gaffney owes the company half of the $1.5 million sign-on bonus he received due to his resigning less than two years after being hired.

Gaffney was hired in November 2017. The suit, filed in the U.S. District Court for the Western District of Pennsylvania, Gaffney’s contract called for Gaffney to refund 100 percent of his $1.5 million sign-on bonus if he left Dick’s within a year after being hired and 50 percent of the bonus if he left within two years.