About 6:30 that evening, he was driving his employer's van when he took exception to something a fellow driver did. He "threatened two other people with a handgun," HPD says, but -- trying hard to be fair -- adds "but did not shoot them."
On the other hand, he wasn't done yet.
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Police say Olvera, 33, and another man, now identified as Luis Salinas-Segovia, 35, drove the van to a convenience store in the 8300 block of Park Place and bought some beer.
They went behind the store to drink it and talk, and a dispute -- possibly over the moral philosophy of the autonomy of practical reason, possibly not -- apparently ensued.
Olvera shot and killed Salinas-Segovia and fled on foot, police say.
Anyone with information in this incident, or on the whereabouts of Olvera, is urged to contact the HPD Homicide Division at 713-308-3600 or Crime Stoppers at 713-222-TIPS.