Mr. Eugene (Gene) Serain Mercado, 54, of Clarksburg, Md., passed away at his home on Saturday, Jan. 24, 2026.
He was the loving husband of Katherine Killmon Mercado for 15 years. Born on March 27, 1971, in San Manuel, Philippines, he was the son of Eulogio Molina Mercado and Leticia Serain Mercado.
In addition to his wife, he is also survived by his children: Gabriella Rose, Grayson Luke, and Caroline Violet; his sisters, Lillian Serain Mercado Herme (Wilson) and Cleofe Serain Mercado; his brother-in-law, Christopher Martin Killmon (Lori); his mother-in-law, Charlotte Bundick Killmon; and his nieces, Emily Davis Killmon, Abigail Brown Killmon, Alara Corinne Herme, Alexandria Lucia Herme, Aleia Solei Herme, and Wilan Kealani Herme.
Preceding him in death were his parents and his father-in-law, Jerry Doughty Killmon.
Gene was a graduate of Mercer University in Macon, Ga. He earned a bachelor’s degree in biomedical engineering and physics.
Professionally, he worked in telecommunications engineering and project management.
He had recently decided to pursue a lifelong desire to work in the medical field by enrolling at University of Maryland, School of Nursing.
He was actively involved in church communities throughout his adult life and was a member of Monument Church in Damascus, Md.
Beyond the time he cherished with his family, he enjoyed both playing and watching tennis, gardening, hiking, cooking, and bringing people together to share delicious food.
A service to celebrate his life was held at Covenant Life Church, Gaithersburg, Md., on Saturday, Jan. 31, at 2 p.m.
In lieu of flowers, donations may be made in Gene’s memory to: Christ Church of San Francisco, 6926 California St., San Francisco, CA 94121 or Monument Church, P.O. Box 545, Damascus, MD 20872.
