We have to keep in mind that it is the tradition of the Catholic church that Peter died in Rome.
The UNCONFIRMED historical report that Peter died on a Roman cross had a purpose. Its purpose was and is to undermine the Word of God and render the words and prophecy of Jesus Christ null and void. Had the unconfirmed historical report never surfaced, there would be little discussion today of how the Apostle Peter died. Scripture plainly tells us how he died. Therefore, the interpretation of the description of Peter's death is marred when it is reported that according to history, the Apostle Peter was a martyr, crucified on a cross, and perhaps even crucified upside down. The historical facts may be true regarding such a Peter, but it was not THE Apostle Peter. The name Peter was a very common name similar to our Bob, Bill, John, etc. There may have been someone who underwent that particular fate. However, it was NOT THE APOSTLE PETER. The report that Peter died upon a Roman cross and perhaps upside down serves only to glorify the FLESH. Christians seize upon this opportunity to elevate the Apostle Peter to a high human plain and glory in the fact of his martyrdom. They praise his courage, his unyielding faith, and uncompromising determination to follow Christ in the face of such a dilemma. But this was not what God had in mind for Peter, for Jesus said "Verily, verily, I say unto thee, When thou wast young, thou girdedst thyself, and walkedst whither thou wouldest: but when thou shalt be old, thou shalt stretch forth thy hands, and another shall gird thee, and carry thee whither thou wouldest not. This He spoke, signifying by what death he (Peter) would GLORIFY GOD". The popular historical report of Peter's death has succeeded in drawing many (otherwise) good Bible Teachers away from the facts and words of scripture and into a world of supposition and conjecture. It is because of this departure from scripture that the Apostles and New Testament writers left us with this final warning . .
Jude 1:17 But, beloved, REMEMBER YE THE WORDS which were spoken before of the APOSTLES of our Lord Jesus Christ: - II Peter 3:1-2This second epistle, beloved, I now write unto you in both which I stir up your pure minds by way of remembrance, that you may BE MINDFUL OF THE WORDS which were spoken before by the holy prophets, and of the commandment of us, the apostles of the Lord and Savior,
Peter died of old age and was taken care of (another shall gird thee and take him places he could not go).