MRI showed that he was in Heart failure.; Died on the flight and they brought him back; blood clots in his heart and the bottom of his heart was already dead; He had myocarditis; weight went down; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the parent.  A 24-year-old male patient received BNT162b2 (BNT162B2), on 05Jan2022 as dose  2, single (Batch/Lot number: unknown) at the age of 24 years, in arm for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Covid-19 vaccine (DOSE 1; Manufacturer unknown), for COVID-19 IMMUNIZATION. The following information was reported: CARDIAC ARREST (death, hospitalization, medically significant, life threatening) with onset 2022, outcome "fatal", described as "Died on the flight and they brought him back"; MYOCARDITIS (death, hospitalization, medically significant, life threatening) with onset 2022, outcome "fatal", described as "He had myocarditis"; CARDIAC FAILURE (death, hospitalization, medically significant, life threatening) with onset 2022, outcome "fatal", described as "MRI showed that he was in Heart failure."; CORONARY ARTERY THROMBOSIS (death, hospitalization, medically significant) with onset 2022, outcome "fatal", described as "blood clots in his heart and the bottom of his heart was already dead"; WEIGHT DECREASED (non-serious) with onset 2022, outcome "unknown", described as "weight went down". The patient was hospitalized for cardiac failure, cardiac arrest, coronary artery thrombosis, myocarditis (start date: 07May2022, hospitalization duration: 37 day(s)). The patient underwent the following laboratory tests and procedures: Biopsy heart: (2022) Unknown results, notes: He still goes to cardiac rehab and has cardiac biopsies once a month, where they take off like 4 pieces of the heart tissue; Magnetic resonance imaging heart: (Mar2022) blood clots and the bottom of his heart was dead; (Mar2022) Heart failure, notes: Cardiac MRI showed that he was in Heart failure; Weight: (2022) weight went down, notes: He was in the hospital for 37 days and weight went down. Therapeutic measures were taken as a result of cardiac failure, cardiac arrest, coronary artery thrombosis, myocarditis. The patient date of death was unknown. Reported cause of death: "MRI showed that he was in Heart failure.", "He died on the flight and they brought him back.", "blood clots in his heart and the bottom of his heart was already dead", "He had myocarditis". It was not reported if an autopsy was performed.  Clinical course: Caller on the line calling about her sons Pfizer Covid-19 Vaccine second dose. She wanted to report what happened to her son. Her son received a heart transplant after his second dose. He was healthy 24-year-old. It happened on 16May2022. They have been so depressed and it has really taken a toll on her family and that she has cancer and everything. It should have never happened to him. He was in the hospital for 37 days and weight went down. The timeline points to the vaccine according to her sons doctor, but no one can prove it. Over 2.5 million dollars for the heart transplant, he has damage in his Left femoral artery from the life support they had him on that kept him living until they could find a heart. She took him into hospital on 07May2022 because he had blood clots in his heart and the bottom of his heart was already dead. Cardiac MRI showed that he was in Heart failure. He was transferred to hospital on 05May2022, then was flown to another institute. He died on the flight and they brought him back. He went to a cardiac rehab after his hospitalization. He was discharged from the hospital around 06Jun2022. He still goes to cardiac rehab and has cardiac biopsies once a month, where they take off like 4 pieces of the heart tissue. He recovered a couple month afterwards, but still has issues. Takes 26 pills in the morning now and 14 pills to keep his immunes system suppressed. Her son cant work because of this. Her son has his vaccination card. He refused the vaccine in the hospital. He was a healthy 24-year-old with a job as a carpenter and had a healthy life. Her son nearly died. He only received 2 doses. MRI: Said that his heart looked like a 60 something year old man that has been through heart attacks. He had myocarditis. It is hard on him does not like to talk about what happened.   The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.; Reported Cause(s) of Death: He died on the flight and they brought him back.; blood clots in his heart and the bottom of his heart was already dead; He had myocarditis; MRI showed that he was in Heart failure.