Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
List of Iranian assassinations
Table title:
By the Islamic Republic of Iran
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > City </th><th colspan=1 rowspan=1 > Country </th><th colspan=1 rowspan=1 > Target </th><th colspan=1 rowspan=1 > Position </th><th colspan=1 rowspan=1 > Killer </th></tr>
<tr> <td colspan=1 rowspan=1 > 7 December 1979 </td><td colspan=1 rowspan=1 > Paris </td><td colspan=1 rowspan=1 > France </td><td colspan=1 rowspan=1 > Shahriar Shafiq </td><td colspan=1 rowspan=1 > Head of the Iran Azad Group, nephew of the last Shah of Iran </td><td colspan=1 rowspan=1 > Muslim Liberation Group </td></tr>
<tr> <td colspan=1 rowspan=1 > 22 July 1980 </td><td colspan=1 rowspan=1 > Bethesda, Maryland </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > Ali Akbar Tabatabaei </td><td colspan=1 rowspan=1 > President of the Iran Freedom Foundation, former press attache to the Iranian embassy </td><td colspan=1 rowspan=1 > Dawud Salahuddin </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 February 1984 </td><td colspan=1 rowspan=1 > Paris </td><td colspan=1 rowspan=1 > France </td><td colspan=1 rowspan=1 > Gholam Ali Oveisi </td><td colspan=1 rowspan=1 > former Chief Commander of the Imperial Iranian Armed Forces </td><td colspan=1 rowspan=1 > Islamic Jihad Organization </td></tr>
<tr> <td colspan=1 rowspan=1 > 19 May 1987 </td><td colspan=1 rowspan=3 > Vienna </td><td colspan=1 rowspan=3 > Austria </td><td colspan=1 rowspan=1 > Hamid Reza Chitgar </td><td colspan=1 rowspan=1 > Representative of Labor Party of Iran </td><td class="highlighted"  colspan=1 rowspan=3 > Suspected Iranian agents </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=2 > July 13, 1989 </td><td class="highlighted"  colspan=1 rowspan=1 > Abdul Rahman Ghassemlou </td><td class="highlighted"  colspan=1 rowspan=1 > Head of the Democratic Party of Iranian Kurdistan </td></tr>
<tr> <td colspan=1 rowspan=1 > Abdullah Ghaderi Azar </td><td colspan=1 rowspan=1 > Assistant to the Head of Democratic Party of Iranian Kurdistan </td></tr>
<tr> <td colspan=1 rowspan=1 > 1 April 1990 </td><td colspan=1 rowspan=1 > Nynäshamn </td><td colspan=1 rowspan=1 > Sweden </td><td colspan=1 rowspan=1 > Karim Mohammedzadeh </td><td colspan=1 rowspan=1 > Iranian Kurdish dissident </td><td colspan=1 rowspan=1 > Reza Taslimi </td></tr>
<tr> <td colspan=1 rowspan=1 > 24 April 1990 </td><td colspan=1 rowspan=1 > Coppet </td><td colspan=1 rowspan=1 > Switzerland </td><td colspan=1 rowspan=1 > Kazem Rajavi </td><td colspan=1 rowspan=1 > Representative of the National Council of Resistance of Iran.Former Ambassador of Iran to the UN </td><td colspan=1 rowspan=2 > Suspected Iranian agents </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 September 1990 </td><td colspan=1 rowspan=1 > Västerås </td><td colspan=1 rowspan=1 > Sweden </td><td colspan=1 rowspan=1 > Efat Ghazi </td><td colspan=1 rowspan=1 > Member of the Kurdistan Democratic Party of Iran </td></tr>
<tr> <td colspan=1 rowspan=1 > 12 July 1991 </td><td colspan=1 rowspan=1 > Tsukuba </td><td colspan=1 rowspan=1 > Japan </td><td colspan=1 rowspan=1 > Hitoshi Igarashi </td><td colspan=1 rowspan=1 > Japanese translator of Salman Rushdie's novel The Satanic Verses. </td><td colspan=1 rowspan=1 > Islamic Revolutionary Guard Corps </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 August 1991 </td><td colspan=1 rowspan=1 > Suresnes </td><td colspan=1 rowspan=1 > France </td><td colspan=1 rowspan=1 > Shapour Bakhtiar </td><td colspan=1 rowspan=1 > former Prime Minister of Iran.Head of the National Resistance Movement of Iran </td><td colspan=1 rowspan=1 > Ali Vakili Rad </td></tr>
<tr> <td colspan=1 rowspan=1 > August 7 1992 </td><td colspan=1 rowspan=1 > Bonn </td><td colspan=1 rowspan=5 > Germany </td><td colspan=1 rowspan=1 > Fereydoun Farrokhzad </td><td colspan=1 rowspan=1 > Iranian dissident </td><td colspan=1 rowspan=1 > Suspected Iranian agents </td></tr>
<tr> <td colspan=1 rowspan=4 > September 17 1992 </td><td colspan=1 rowspan=4 > Berlin </td><td colspan=1 rowspan=1 > Sadegh Sharafkandi </td><td colspan=1 rowspan=1 > Head of the Democratic Party of Iranian Kurdistan </td><td colspan=1 rowspan=4 > Mykonos restaurant assassinations </td></tr>
<tr> <td colspan=1 rowspan=1 > Fattah Abdoli </td><td colspan=1 rowspan=3 > One of the leaders of the Democratic Party of Iranian Kurdistan </td></tr>
<tr> <td colspan=1 rowspan=1 > Homayoun Ardalan </td></tr>
<tr> <td colspan=1 rowspan=1 > Nouri Dehkordi </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 July 1996 </td><td colspan=1 rowspan=1 > Stockholm </td><td colspan=1 rowspan=1 > Sweden </td><td colspan=1 rowspan=1 > Kamran Hedayati </td><td colspan=1 rowspan=1 > Iranian Kurdish dissident </td><td colspan=1 rowspan=1 > Suspected Iranian agents </td></tr>
<tr> <td colspan=1 rowspan=1 > 29 April 2017 </td><td colspan=1 rowspan=1 > Istanbul </td><td colspan=1 rowspan=1 > Turkey </td><td colspan=1 rowspan=1 > Saeed Karimian </td><td colspan=1 rowspan=1 > Iranian television executive, owner of Dubai-based GEM TV </td><td colspan=1 rowspan=1 > Ministry of Intelligence of Islamic Republic of Iran </td></tr>
</table>
Question:
What happened to Ghassemlou in 1989?
Answer:
Ghassemlou was the leader of the Democratic Party of Iranian Kurdistan until his assassination in 1989 by suspected agents of the Islamic Republic of Iran.