He suffered a heart attack on the pitch in a friendly match against SK Hlinsko Old Boys.

Slavia Prague Old Boys won 4-2, but in the midst of the game, Kopecký collapsed to the floor and František Plánička tried to revive him.

[3][4] Josef Bican commented on his and Vlastimil's relationship on the field; "We understood each other perfectly: we were, as it were, connected mentally.

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