Born in Baltimore and raised on Old Frederick Road in Irvington, he was the son of Thomas Hynes and Adelaide Zell Hynes. He was a 1943 graduate of Holy Cross Preparatory Seminary in 1943 and then began his formal training at St. Paul of the Cross Monastery in Pittsburgh. He completed his studies in philosophy and theology at several Passionist monasteries, and earned a master's degree in theology.
Father Hynes was ordained to the priesthood by Bishop Thomas McNulty in 1951 at St. Michael Monastery in Union City, N.J.
He led parish missions and retreats from 1952 to 1955, then returned to Baltimore and became an associate priest at St. Joseph's Passionist Monastery in Irvington in Southwest Baltimore. He held the post from 1955 to 1957.
He resumed his preaching and visited parishes from 1957 to 1971. He worked at the former Passionist Spiritual Center at St. Joseph Monastery in Irvington from 1971 to 1980.
From 1981 to 1985, he was assigned to St. Charles Boromeo in Pikesville. In 1985, he joined the staff at St. Ursula Parish in Parkville, where he was serving at the time of his death.
A Mass of Christian burial will be offerred at 10 a.m. Wednesday at St. Ursula Church, 8801 Harford Road in Parkville.
Survivors include his nieces and nephews.