Two mothers whose daughters were allegedly killed by the same man met for the first time this week — joining hands in a moment of unity as they tried to cope with a pain both said they will never forget.

Sitting at a table in the South Baltimore offices of You Are Never Alone, an outreach organization for prostitutes, Joyce Heinonen, the mother of Emma O’Hearn, 25, and Annette Mills, the mother of Antiona Mills, 15, shared the grief of losing a child, possibly at the hands of a serial predator.