Phillips says in a statement released by ESPN Wednesday that he's sorry to have "put his family and colleagues through this."
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ESPN has granted Phillips' request for time off, and has taken unspecified disciplinary action.
Police say 22-year-old ESPN production assistant Brooke Hundley called Phillips' wife in August after he broke off the affair and sent her a letter graphically describing their relationship.
Phillips says he will not press charges. The status of the police investigation was unclear Wednesday.
ESPN says Hundley is still working for the network.