The sentencing of Jorge Rueda Landeros revived prosecutors’ account of a relationship that mixed romance, business dealings and, they said, a lethal break.
ROCKVILLE, Md. — When a Montgomery County judge sentenced Jorge Rueda Landeros to 25 years in prison for killing professor Sue Ann Marcum, the facts revisited in court pointed repeatedly to the money that prosecutors said had fractured their relationship before her death.
This version of the case was never only about identifying a suspect. It was about explaining motive in a homicide where the victim and defendant knew each other well. Marcum, 52, was an American University professor living in Bethesda. Landeros, prosecutors said, had been her Spanish teacher and yoga instructor before becoming her romantic partner and business associate. By the time she was killed in October 2010, prosecutors said, the bond between them had soured over investments, missing money and broken trust. The later murder conviction and March 3 sentence gave legal force to that narrative, even though the path there took years and stretched into Mexico.
Financial records and communications became central to the prosecution’s picture of what happened before the killing. Officials said Marcum and Landeros made investments using her money and that over about two years she lost $312,000 while he gained $252,000. Reporting on the case also said Marcum had turned over roughly $300,000 without getting anything in return and that Landeros made himself the sole beneficiary of her $500,000 life insurance policy. One email from October 2008 captured the strain. In that message, Marcum wrote that the image of Landeros sitting at her kitchen table and showing no remorse for spending the money was “physically playing havoc” with her body. Those details helped prosecutors portray the case as a betrayal with both emotional and financial dimensions. By the time of sentencing, the numbers had become part of how the killing was publicly understood.
The homicide itself did not immediately present that story on its face. Marcum was found dead on Oct. 25, 2010, inside her home on Massachusetts Avenue in Bethesda. She had been beaten and strangled, and the medical examiner listed blunt force trauma and asphyxiation as the cause of death. Detectives initially encountered what looked like a burglary scene. A rear window appeared to be the point of entry, and some valuables were missing. But investigators later said the burglary had been staged. That conclusion sharpened the role of motive. A staged break-in suggested planning, concealment and familiarity with the victim’s home rather than an impulsive attack by a stranger. Once detectives turned to Marcum’s emails and personal circle, the financial conflict with Landeros became part of the explanation for why police believed the killing was personal.
Evidence and flight then took over the case. Detectives recovered DNA at the scene from someone other than Marcum and eventually matched it to Landeros, officials said, after reviewing her relationship with him and comparing the crime scene evidence with a cheek swab obtained during a border crossing. Police said the DNA identified him as a suspect in April 2011 and that an arrest warrant was issued. By then, however, he had disappeared into Mexico. Authorities later said he was taken into custody in December 2022 and extradited to Maryland in 2023. During the 2025 trial, the defense argued that the presence of his DNA in Marcum’s home was not unusual because of their close relationship. Prosecutors answered that the relationship itself, including the financial collapse around it, was the reason the evidence made sense rather than the reason to dismiss it.
The jury convicted Landeros of second-degree murder on Oct. 30, 2025, after an eight-day trial, and Judge Rachel McGuckian sentenced him on March 3, 2026, to 25 years in prison. Friends and relatives made clear at sentencing that the case was about more than money, even if money had helped shape its motive theory. Alan Marcum and Larry March spoke about Sue Ann Marcum as a teacher, mentor and lively presence who had been trying to rebuild her life. American University’s memorial materials describe a professor whose work touched students across years. That contrast — dry financial records on one side, a vivid personal legacy on the other — gave the case much of its force. Prosecutors used the numbers to explain why they said she was killed. Her family used the hearing to remind the court who she had been before those numbers entered the record.
The immediate next chapter is limited to the ordinary steps that can follow a felony sentence, but the core shape of the case is now fixed: a personal and financial relationship deteriorated, a homicide scene was staged to look like something else and, after years of delay, a judge imposed punishment in Montgomery County. For Marcum’s family, the legal answer arrived late, but it arrived.
Author note: Last updated March 31, 2026.