Blackwood's best season was in 1977, when he intercepted 10 passes for the Baltimore Colts, helping them win their third consecutive AFC East division title.
He later became known for teaming alongside his brother, Glenn Blackwood with the Miami Dolphins as part of the notorious "Killer B's" defense.
This formidable team won several division titles (1981, 1983, 1984, 1985) and made two Super Bowl appearances (1982, 1984).
A similar Dolphin team with the "Killer B's" and company upset the 1985 Chicago Bears (15–1) and kept them from an undefeated season.
This biographical article relating to an American football defensive back born in the 1950s is a stub.