<apex:page standardController="Lead" extensions="LeadConvertedViewController" readOnly="true">

    <apex:pageBlock>

        <apex:pageBlockSection columns="1">

            <!--
              Unfortunately, you have to build out the page yourself
              to show chatter feed, fields and any related lists.
              You cannot use the <apex:detail> tag that would naturally
              render the user's appropriate page layout, will get Insufficient Privileges.
            -->

            <apex:outputField value="{!record.firstName}"/>
            <apex:outputField value="{!record.lastName}"/>
            <apex:outputField value="{!record.company}"/>

        </apex:pageBlockSection>

    </apex:pageBlock>

</apex:page>