A veteran cop who has given grand jury testimony in the NYPD ticket-fixing case grabbed the third rail of an elevated subway track today in what might have been a suicide attempt. Robert McGee, an officer for more than three decades, was hospitalized and is expected to recover, but sources say he’s been “under a lot of pressure” because of the ongoing investigation. More than a dozen officers are expected to be charged in the Bronx with helping friends, family, and VIPs avoid paying fines. McGee was given immunity for his grand jury appearance, but feared having to testify against his fellow cops at trial. Recently he attempted to retire, but was prohibited because he was under investigation.