HARRISBURG — Pennsylvania state Treasurer Rob McCord is stepping down after six years, his Thursday announcement coming just before it emerged that federal investigators are making inquiries into the campaign-related activity of the Democrat who spent nearly $9 million in an unsuccessful run for governor.

A person familiar with the inquiries by authorities confirmed the existence of the probe to The Associated Press.

In a statement and letter released by his office, the former venture capitalist made no mention of scrutiny by authorities, and gave no reason for leaving his post, saying only that it is time for him to return to the private sector after six years in the job.

“It has been the privilege of a lifetime to serve the citizens of the commonwealth as their elected state treasurer for the past six years,” McCord wrote in a letter to Gov. Tom Wolf.

“But with my goals at Treasury now achieved — and with a new governor now in office to appoint my successor — it is time for me to return to the private sector, where most of my life’s work has been.”