PLANO, Texas -- Police say a man charged in the slaying of an ex-girlfriend has been accused of killing a second woman whose body was found in a Dallas lake days later, and investigators fear there could be more victims.

Plano police on Friday announced a capital murder charge against 23-year-old Reginald Gerard Kimbro. Jail records don't list an attorney for Kimbro, whose bond tops $1 million.

Officials say Kimbro is charged with killing 36-year-old Megan Getrum, who was last seen April 14 leaving her Plano home to go for a walk in a nature preserve. Her body was found the next day in Lake Ray Hubbard, 30 miles away. Kimbro did not know Getrum, police say, and investigators do not know why she was targeted.

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Fort Worth police say 22-year-old Molly Matheson was found slain in her apartment April 10. Investigators said her killer tried to get rid of evidence by washing her body, reports the Dallas Morning News.

Kimbro was arrested April 27 and charged with killing Matheson. The two dated each other when they attended the University of Arkansas.

Investigators say both women were sexually assaulted and strangled. A medical examiner found that Getrum died of blunt force injury, neck compression and drowning, reports the Dallas Morning News, citing court records.

A sexual assault exam found Kimbro's DNA, the paper reports.

Kimbro has been tied to violent assaults dating back to 2012, the station reports, though none of them resulted in prosecutions.

Reginald Kimbro CBS DFW

A Plano woman reported Kimbro raped her on Sept. 22, 2012, but police say she later decided not to pursue charges, reports CBS DFW. On March 21, 2014, another woman accused Kimbro of raping and choking her at a South Padre Island hotel. The district attorney there later dismissed the charges, the station reports.

This week, another woman came forward claiming Kimbro repeatedly choked her in 2014, the station reports.

"It is frustrating to know that neither of these senseless murders would have ever happened if our judicial system had done its job properly," Matheson's family said in a statement released to CBS DFW.

Plano police say they're poring over any unsolved rapes or murders with possible ties to Kimbro.

"Could there be a third? Absolutely, there could be a third," Plano Police spokesman David Tilley told CBS DFW. "We're hopeful there's not going to be a third."