The gathering will be held from 5 to 8 p.m. Tuesday at Keeney and Basford Funeral Home, 106 E. Church Street in Frederick.
Sheriff's deputies came to a home in the 6800 block of Woods Court after receiving a 911 call from a neighbor Wednesday night.
Once there, they found Benyam "Ben" Asefa, 40, Barbara Giomarelli, 42, and 3-month-old son Samuel Asefa all dead from gunshot wounds, said Capt. Tim Clarke, of the Frederick County Sheriff's Office.
The couple's surviving 5-year-old daughter had left the home and told a neighbor that "her family was injured," said Clarke.
Tuesday's memorial services are open to the public and friends and family are invited to share thoughts and memories of the deceased, according to Keeney and Basford Funeral Home staff.
Frederick County Division of Fire and Rescue Services Chief Denise Pouget said medical personnel were called to the scene Wednesday night, but staged away from the home while deputies entered. She later learned their services were not needed, she said.
The three were pronounced dead in the same room inside the home, said Clarke.
The sheriff's office has not yet disclosed further details about the investigation or how their bodies were found.
Benyam Asefa was born in Addis Ababa, Ethiopia, according to his obituary.
He most recently worked as a clinical immunologist at the Lovelace Respiratory Research Institute, a subcontractor to Battelle Memorial Institute, according to the National Institutes of Health.
In lieu of flowers, donations can be made on his behalf to UNICEF, a United Nations program to assist children in developing countries, according to the obituary.
Giomarelli was born in Siena, Italy, according to the obituary.
She was a researcher for the University of Maryland Center for Environmental Science at the Institute of Marine and Environmental Technology, according to institute staff.
In lieu of flowers, contributions may be made on her behalf to Heartly House, Inc. to assist families of domestic violence in Frederick, her obituary stated.