Izzard appeared in 50 games in five seasons with Penn State.
The Nittany Lions are 0-4 for the first time since 1999.
The Nittany Lions jumped out to an early three-goal lead and never looked back.
Katie DeSa did not allow a single-goal on the weekend.
Johnson joins former Penn State running back London Montgomery, who transferred to the Pirates last year.
The goal opened the scoring in Penn State's 4-0 shutout victory against Canisus