Seen this dude?

It's the face of a suspect in three unsolved sexual attacks along the Esplanade and in South Boston last year, officials say.

State and Boston police and the Suffolk County DA's office released the sketch today of a man they say attacked a woman jogging on the Esplanade around 11 p.m. on July 29, 2007 and whom they believe is involved in a similar attack on June 16, 2007 near the Esplanade and on July 29, 2006 at Moakley Park in South Boston.

Each victim described her assailant as a clean-shaven African-American male in his mid-20s to mid-30s, standing 5'8" to 5'10". At the time of the attacks, he had a medium to large build and a bald head.

Officials say they are also looking for some specific people they believe may have witnessed the Back Bay attacker: A lone male present near an Esplanade footbridge around 11:15 the night of the Esplanade attack; A pair of bicyclists wearing helmets and cycling gear who were walking their bikes near the footbridges between 4:30 and 5:00 a.m. on July 29, 2007 - whose presence prompted the attacker assailant to put his arm around the woman as if they were a couple; and a man and woman, both well-dressed and in their late 20s, who were near Joe's American Bar and Grill at the intersection of Dartmouth and Newbury streets between 5:00 and 5:30 a.m. that same day.

Info? Call the State Police at 617-727-6780 or the Boston Police CrimeStoppers tip line at 1-800-494-TIPS - or text the word "tip" to CRIME (27463).