MEXICO, Maine — River Valley residents reacted with shock and disbelief Wednesday morning to the deaths of a Rumford couple and the serious injuries of a Mexico couple in a head-on collision in Brewer on Tuesday.

Police said Joseph Richard, 76, of Mexico, was traveling west on Route 9 when his vehicle crossed the centerline and hit an SUV driven by Robert Collins of Barnstable, Mass.

Two passengers in Richard’s vehicle, his brother-in-law, Joseph Wilfred Laplante, 85, and his sister, Ella Laplante, 86, both of Rumford, died in the crash. Richard and his wife, Marjorie, were seriously injured.