He left the United States for Italy in the early 1960s, where he started a modest film career as a supporting actor, appearing mostly in spaghetti westerns, sexploitation and horror.
The Desert Tigers!, directed by Paolo Solvay and starring fellow American expatriates Richard Harrison and Gordon Mitchell (with whom Monty shared an apartment for several years in Italy).
The Desert Tigers was no exception to the rule, featuring footage from his World War II epic Quando Suana la Campana AKA When the Bell Tolls (1970).
Over the decade, he appeared in countless low-budget Filipino features and some Italian productions shot in the archipelago, often cast as a military officer or a policeman, in parts very similar to Richard Crenna in First Blood.
Monty also appeared in all of the films Richard Harrison made in the Philippines: as a POW in Intrusion Cambodia AKA Rescue Team, a police chief in Fireback and as a gangster in Blood Debts.