Who was the tax collector that followed Jesus?

Matthew 9:9 - As Jesus passed on from there, He saw a man named Matthew sitting at the tax office. And He said to him, "Follow Me." So he arose and followed Him.

Matthew 10:2-4 - Now the names of the twelve apostles are these: first, Simon, who is called Peter, and Andrew his brother; James the son of Zebedee, and John his brother; Philip and Bartholomew; Thomas and Matthew the tax collector; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus; Simon the Canaanite, and Judas Iscariot, who also betrayed Him.[NKJV]