Career
He was the author of more than three dozen books on New England history and folklore, as well as on scuba diving, shipwrecks and pirates. Cahill served in the Massachusetts House of Representatives from 1970 to 1975. In 1974, Cahill was elected Sheriff of Essex County, Massachusetts.
During his tenure as Sheriff, Cahill sought to modernize the department.
The jails in Salem and Lawrence lacked toilets, which meant inmates had to defecate in buckets. There were also no rehabilitation programs in either jail and guards had no formal training.
The minimum-security Correctional Alternative Center in Lawrence opened during Cahill"s tenure. While serving as Sheriff, Cahill investigated an alleged curse Giles Corey placed on the office.
He found that all Essex County Sheriffs as far back as he could trace either died in office of heart problems or retired due to "an ailment of the blood".
In 1978, Cahill, who suffered from a rare blood disorder himself, retired after he suffered a heart attack and stroke.