Murderer Sentenced for Stabbing Girlfriend

A San Diego County murder case that had already ended in a first-degree conviction reached its final courtroom step this week. Ziyah Jay Patterson, 31, got 26 years to life in state prison for killing his girlfriend, Angela Marie Lanway, in San Marcos. The crime happened on Dec. 26, 2023, but the sentencing matters now because it closes the trial phase and fixes the punishment after months of court proceedings. (sandiegouniontribune.com) ### What was Patterson sentenced for? He was sentenced for the first-degree murder of Lanway, who was 42. A Vista jury had already found him guilty in February 2026 and also found true an allegation that he used a knife in the killing. That extra finding matters because it helped shape the final prison term — 26 years to life, not a shorter sentence on the murder count alone. (patch.com) ### What happened the night Lanway was killed? The attack happened behind a business in San Marcos, near North Twin Oaks Valley Road, where both Patterson and Lanway were living while homeless. Prosecutors said the two argued after Lanway asked him to turn down his music. Patterson got ang(patch.com)fered wounds to the ear and neck, including a severed artery and a broken bone in her spine. (danewscenter.com) ### Why was this treated as first-degree murder? That charge means jurors were persuaded this was not an accident or a split-second act that fit a lesser homicide theory. Prosecutors pointed to the sequence — argument, beating, then a decision to pull out a knife and stab he(danewscenter.com) matter a lot in showing deliberation and intent. (danewscenter.com) ### What did Patterson say in his defense? At trial, Patterson testified that he acted in self-defense and claimed he was the victim of domestic violence. But that argument did not land with the jury. Prosecutors said there was no evidence supporting his account and that he (danewscenter.com)e out of one eye. (danewscenter.com) ### Why does Lanway’s vulnerability matter here? Because it changes how the facts read. This was not a fight between two evenly matched people. Lanway was already in a precarious situation — homeless, physically impaired, and living in an exposed setting behind a business. T(danewscenter.com)killing and a crime against a particularly vulnerable victim. (danewscenter.com) ### Is this part of a bigger domestic-violence problem? Yes — and that is a big reason the case got broader attention. The San Diego County District Attorney’s office said seven people were killed by a current or former intimate partner in 2024, plus one additional homicide (danewscenter.com) below the county’s longer-term average. (danewscenter.com) ### Why is homelessness part of the story? Because the living conditions were not just background detail. They were part of the danger. The DA’s office explicitly tied the case to how domestic violence can become even more lethal when people are living in unstable, exposed c(danewscenter.com)lity stacks — abusive dynamics, physical disability, and homelessness all at once. (danewscenter.com) ### What’s the bottom line? The immediate news is simple — Patterson’s punishment is now set. But the case sticks because it was not just a murder prosecution. It was a domestic-violence killing shaped by extreme vulnerability, and the sentence closes the courtroom chapter without changing the conditions that made Lanway so exposed in the first place. (sandiegouniontribune.com)