For his silver jubilee as a priest almost a decade ago, Franciscan Fr Ed Mundwiller prayed for God to keep calling him beyond the boundaries of his own comfort zone, into places he never thought he would go.

"The old 'normal' and the old certainties go away, and God fills in the void with a call to justice and decency," he said in a 2007 interview with The Catholic Missourian, newspaper of the Diocese of Jefferson City in central Missouri.

Fr Mundwiller, who goes by "Friar Ed," believes that is exactly what happened while he was walking in his St Louis neighbourhood the afternoon of February 2.