As A Matter of Fact!

Did Jesus die on a cross?
WHAT SOME PEOPLE SAY

The Romans executed Jesus by hanging him on a cross made of two pieces of wood.
WHAT THE BIBLE SAYS

Jesus was executed “by hanging on a tree.” (Acts 5:30, The New Jerusalem Bible) Both of the words used by Bible writers to describe the instrument of Jesus’ death suggest one piece of wood, not two. The Greek word stau·rosʹ, according to Crucifixion in Antiquity, means “a pole in the broadest sense. It is not the equivalent of a ‘cross.’” The word xyʹlon, used at Acts 5:30, is “simply an upright pale or stake to which the Romans nailed those who were thus said to be crucified.”*
The Bible also relates the method of Jesus’ execution to an ancient Israelite law. The law stipulated: “If a man commits a sin deserving the sentence of death and he has been put to death and you have hung him on a stake, . . . the one hung up is something accursed of God.” (Deuteronomy 21:22, 23) Referring to that law, the Christian apostle Paul wrote that Jesus became “a curse instead of us, because it is written: ‘Accursed is every man hung upon a stake [xyʹlon].’” (Galatians 3:13) Paul thus indicated that Jesus died on a stake​—a single piece of wood.
“They killed him by hanging him on a tree.”​—Acts 10:39, The New Jerusalem Bible.

^ par. 8 A Critical Lexicon and Concordance to the English and Greek New Testament, 11th Edition, by Ethelbert W. Bullinger, pages 818-819.