Margaret Aspinall, whose 18-year-old son James died during the Hillsborough disaster, said she was "absolutely delighted" to hear Sir Norman Bettison is retiring.
The chairwoman of the Hillsborough Families Support Group said: "Obviously I'm very very pleased. I'm absolutely delighted that he's going. But then, he'll be going on his full pension, and I'd like to know the full reasons why he's choosing to retire as soon as this".
The chief constable of West Yorkshire has announced he will retire on 31 March 2013.
Ms Aspinall continued: "Why didn't he stay then, until the IPCC came out with their investigation?"
"But he's decided to leave. I'm not arguing against it, because I'm thrilled that he is going, but if he's got nothing to hide, why is he retiring? The man has got something to worry about".