One was a 30-year-old white woman, beaten and strangled to death by an unknown assailant in the thick brush of Spring Creek Park earlier this month.

The other was a 19-year-old African-American student, shot and killed while sitting with a friend on his mother’s porch in his native Chicago on Aug. 14 in a likely case of mistaken identity.

Karina Vetrano and Arshell Dennis III and the way in which they died couldn’t be more different. But what they did have in common was St. John’s University, where the former graduated from last year and the latter was in the midst of earning a degree.

In the wake of the two murders that rocked its campus, the college announced on Tuesday in an email to students and staff that it will hold on-campus memorial services for both Vetrano and Dennis in early September.

“Both of their lives, filled with determination and great promise, were taken away far too soon,” St. John’s University President Conrado “Bobby” Gempesaw wrote. “Karina and Arshell will always be part of the St. John’s family and remembered for the joy and spirit they brought to the University.”

Friday, Sept. 2 will be the memorial Mass in Vetrano’s memory at St. Thomas More Church next to the school’s Great Lawn, while Dennis’ ceremony will be held inside the church on Friday, Sept. 9.

Both events will start at 12:15 p.m.

Vetrano earned a master’s degree in speech-language pathology from St. John’s College of Liberal Arts and Sciences in May 2015.

Dennis, the son of a decorated Chicago police officer, was to begin his junior year this semester.

He was in Illinois to visit his sick mother for her birthday and was murdered just hours before he was set to fly back to Queens.

Reward funds have been established after both killings, with over $100,000 available in Vetrano’s case and $10,000 in Dennis’ case.