Question: When did the father of the person selected in the 1998 NASA Group (G17) convicted of multiple felonies?

Context paragraphs:
List of Serbian regents: This is a list of Serbian regents, a regent (Serbian: намесник/namesnik ), from the Latin "regens" "one who reigns", is a person selected to act as head of state (ruling or not) because the ruler is a minor, not present, or debilitated.

NASA Group Achievement Award: The NASA Group Achievement Award (GAA) is an award given by NASA to groups of government or non-government personnel in recognition of group accomplishments contributing to NASA's mission.  The criteria for earning the Group Achievement Award are:

Regent of Iraq: The Regent of Iraq was a position established in 1939 and held by 'Abd al-Ilah until 1953.  a regent, from the Latin regens "one who reigns", is a person selected to act as head of state (ruling or not) because the ruler is a minor, not present, or debilitated.

Peucestas: Peucestas (in Greek Πευκέστας; lived 4th century BC) was a native of the town of Mieza, in Macedonia, and a distinguished officer in the service of Alexander the Great.  His name is first mentioned as one of those appointed to command a trireme on the Hydaspes.  Previous to this we do not find him holding any command of importance; but it is evident that he must have distinguished himself for his personal valour and prowess, as he was the person selected by Alexander to carry before him in battle the sacred shield, which he had taken down from the temple of Athena at Troy.  In this capacity he was in close attendance upon the king's person in the assault on the capital city of the Malavas (325 BC); and all authors agreed in attributing the chief share in saving the life of Alexander upon that occasion to Peucestas, while they differed as to almost all the other circumstances and persons concerned.

Trick or Treat (TV series): Trick or Treat is a British television show hosted by Derren Brown produced by Objective Productions and broadcast on Channel 4.  The first episode was broadcast on 13 April 2007.  The focus of the show is on one person selected from a pool of volunteers who responded to adverts in the national press to take part in the show.  The experience the volunteer receives is decided by which card they choose.  If they choose the card that says 'Trick' they receive a bad experience and if they choose the card that says 'Treat' they receive a good experience.  This distinction is not always obvious, however: in Series 2, a participant's dark experience of being persuaded to (supposedly) kill a kitten was a 'treat' because of the positive attitude to life Derren believed she would consequently develop; similarly, a volunteer who chose a 'trick' was kidnapped, but had been taught escapology techniques which enabled her to easily escape.

Michael Alfonso (murderer): Michael Alfonso (born Michael Johnson; June 26, 1969 in Illinois) is a former American fugitive who was convicted of multiple felonies, including two counts of murder, in the state of Illinois.  In January 2003, a year and half after the second 2001 murder, he was placed on the FBI's "Ten Most Wanted Fugitives" list, with a $50,000 reward for information leading to his arrest.  After a year and half of being on the run he was captured during a manhunt in Mexico and extradited back to the U.S.

John Poindexter: John Marlan Poindexter (born August 12, 1936) is a retired United States naval officer and Department of Defense official.  He was Deputy National Security Advisor and National Security Advisor for the Reagan administration.  He was convicted in April 1990 of multiple felonies as a result of his actions in the Iran–Contra affair, but his convictions were reversed on appeal in 1991.  More recently, he served a brief stint as the director of the DARPA Information Awareness Office for the George W. Bush administration.  He is the father of NASA astronaut and U.S. Navy Captain Alan G. Poindexter.

Alan G. Poindexter: Alan Goodwin "Dex" Poindexter (November 5, 1961 – July 1, 2012) was an American naval officer and a NASA astronaut.  Poindexter was selected in the 1998 NASA Group (G17) and went into orbit aboard Space Shuttle Missions STS-122, and STS-131

List of Bulgarian regents: This is a list of Bulgarian regents, a regent, from the Latin "regens" "one who reigns", is a person selected to act as head of state (ruling or not) because the ruler is a minor, not present, or debilitated.

Certificate of relief from disabilities: A Certificate of relief from disabilities is issued by a state of the United States of America to a person who has committed a felony or misdemeanor but has subsequently shown that he or she has been rehabilitated.  The closely related "Certificate of good conduct" is given to a person who has committed two or more felonies and has demonstrated rehabilitation.  Potential employers or licensing authorities must consider these certificates as evidence that the person is rehabilitated: if a person has such a certificate, the fact that they were convicted cannot be used as a reason to deny them employment or the granting of a license.  Not all states offer such certificates.

Supporting paragraphs: John Poindexter Alan G. Poindexter
Answer: April 1990