As a historian with a focus on early Christian history and the lives of the apostles, I can provide some insight into the traditional narrative surrounding the martyrdom of Saint Thomas, one of the twelve apostles of Jesus Christ. However, it's important to note that historical records from this period are scarce and often intermixed with hagiography, or the writing of the lives of the saints, which can include legendary elements.
According to tradition, Saint Thomas, also known as Didymus Thomas, is believed to have traveled to India in the 1st century AD to spread the teachings of Christianity. The narrative suggests that he faced significant challenges and was eventually martyred for his faith. The exact details of his death, however, are not well-documented and are largely based on legendary accounts.
The Wikipedia entry you mentioned states that according to tradition, Saint Thomas was allegedly killed at St. Thomas Mount, near Chennai, in 72 A.D. His body was then said to have been interred in Mylapore. This aligns with the common belief that he was martyred with a spear, which is often depicted in artistic representations of his life and death.
Ephrem the Syrian, a prominent theologian of the 4th century, is quoted as stating that the Apostle was martyred in India. Furthermore, it is said that his relics were taken to Edessa, an ancient city in Mesopotamia, which is modern-day southeastern Turkey. The transfer of his relics to Edessa is significant as it indicates the spread of Christianity to different parts of the world and the veneration of Saint Thomas as a martyr and saint.
However, the identity of the person or the group that killed Saint Thomas remains unknown. The historical accounts do not provide a clear answer to this question, and the lack of contemporary records from the 1st century AD means that much of what we know is based on later writings and oral traditions, which can be subject to embellishment and variation.
It's also worth noting that the historical context of the 1st century AD was one of religious and cultural diversity, with various groups and sects vying for influence and power. In such an environment, it's plausible that Saint Thomas could have been killed by a range of individuals or groups, from local rulers to other religious factions, who may have seen his missionary activities as a threat.
In conclusion, while the traditional narrative tells us that Saint Thomas was martyred in India, the exact circumstances of his death, including the identity of his killers, remain shrouded in mystery. The accounts we have are a mix of historical fact and hagiographical storytelling, which serves to inspire and instruct the faithful rather than provide a strictly accurate historical record. As a historian, one must approach these sources with a critical eye, acknowledging the limitations and the rich tapestry of tradition that they represent.

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Wikipedia states --According to tradition, Saint Thomas was allegedly killed at St.Thomas Mount, near Chennai, in 72A.D and his body was interred in Mylapore. Ephrem the Syrian states that the Apostle was martyred in India, and that his relics were taken then to Edessa. ... I don't know who killed him.May 21, 2017read more >>