At the start of the service, people were invited to bring candles to the center of the sanctuary to fill it with light, the same light Mollie exuded.
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Friends who knew Mollie when she was a girl spoke. One person read a letter from her mother who was not in attendance.
Father Leo, who knows the family well, tried to make sense of her murder and offered comfort.
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Mollie's dad Rob Tibbetts was there but declined to be interviewed.
Mollie went missing in Iowa last July. Her body was found in late August. Cristhian Rivera, a 24-year-old undocumented immigrant, is charged with her murder.