José Toribio Losoya belonged to Juan Seguín's company of Tejanos and was among the Tejanos who died in defense of the Alamo.

He was born in the Alamo barrio on April 11, 1808 to Ventura Losoya and Concepción de Los Angles Charlé. The family's two-room stone house, an old Indian dwelling that had been deeded to them, was situated on Plaza de Valero near the southwest corner of the mission's compound.

By 1830 he was a private in the Alamo de Parras military company serving under Lt. Col. José Francisco Ruíz. That year the company built and occupied Fort Tenoxtítlan where Losoya and his family remained until the company's return to San Antonio de Béxar in September of 1832.

Losoya was one of many Mexican soldiers who opposed Santa Ana's despotic rule. By the fall of 1835 Losoya had deserted the Mexican army to enlist as a private (a rifleman) in Juan Seguín's company of Tejanos. In December of that year he participated in the storming of Béxar.

The Losoya family was displaced from their home for many months as the Texans used it and other structures surrounding the Alamo to defend their position.

As Santa Ana's troops converged on San Antonio in February of 1836, Seguín rode from the Alamo leaving seven of his men, including Losoya, behind as reinforcements. Losoya's wife and three children sought refuge in the mission's chapel with several other women, children and slaves.

Losoya died in the final battle on March 6, 1836. In the battle's aftermath, his body was found in the chapel of the mission and was cremated. His ashes were buried with those of the other martyrs .

His wife, son and two daughters survived the siege.